Read my post here
because Ive tanked at low levels with each type most of how it can be done is within what i wrote.
Best was icetank, then stone, then fire (for actual aggro grabbing) then invuln (fast recharge taunt required at lvl 10 now). With a firetank you can avoid kbs (pre 10 they are not much of a prob after that just head to bloody bay at 15 or get hover at lvl 6. The other day due to good team support an icetanker friend of mine lvl 11 was tanking 15-16 in one mission, the rest of the team was 12-13 (i was highest and only one at 13 and it was my mission).
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
Good thing to remember when playing a tank is that 6 x DO:s about equals 3 x SOs and you can do a respec when you hit 24. I had my main protective powers Six-Slotted with DOs until I respecced them to 3xSOs. If you can live with 2 extra "non-SO levels", it's a damn good way to go 
(Helped that I had a freespec ready at 22 so I didn't have the 2 extra levels to worry about)
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With schedule B single origins i think its approximately this
1 SO = +20%
2 SO = +40%
3 SO = +56%
4 SO = +59%
5 SO = +62%
6 SO = +65%
the benefits as you can see tapers off after 3 DO's
i think DO's that are schedule B would offer this
1 DO = +10%
2 DO = +20%
3 DO = +28%
4 DO = +29.5%
5 DO = +31%
6 DO = +32.5%
So past 3 double origins it still tapers off and the last 3 slots add only 4.5%
A good well balanced team willing to cooperate with eachother adds quite a bit more in %.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
It's not the number of enhancements that cause ED to go to work, it's the total bonus you get, so from top of the hat the DO progression should be something like:
+10, +20, +30, +40, +50ish, +55ish
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What you are saying does in a way go with this quote:
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These bonus types start to see reduction when the bonus is 40% or more, and a severe reduction at 60% bonus or greater.
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but i would have to check it out for myself as i am sure someone in the past was hoping to 6 slot DO's but was assured not to.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
Like Alvan said - it's the total bonus that matters, not the number of enhancements slotted. The only disadvantage of 6-slotting a defense shield with 6 DO's is that once you start using SO's you'll need to respec to re-allocate slots to where they'll be of more use.
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Yep i just tested it, i take my hat of to ya Alvan cos ive been tanking on 3 slotted double origin armours post ED till 22 so yeah if only i knew! I dont know actually what would of changed considering my slotting priorities and lack of them between 0 and 22 but it would be funny to work out.
I did a test with 3 slotted SO and a test with 6 slotted DO and the amount of resist offered was exactly the same (well to 2 decimal places anyway).
So hang on i've been 3 slotting, tanking with no personal problems whilst other people have been 6 slotting and saying they are squishie??
All i can say is look at the defenders and controllers and play to suit them well.
Edit: way way back when i was new with shannon (march 2005) it took to mid teens to find out i could even stack slots. I had 4 slotted rest 1 recharge, 1 heal, 1 end mod and 1 interrupt but most of what i faced was toxic so it wouldnt of mattered too much about the stacking.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
That is the way how i got my inv tanker past 22. With the free respec as backup, i slotted all my resist powers 5 DO resist and 1 Endred. Ya, my attacks most were 1 or 2 slotted, but i was running around with resist as of a SO-user.
Downside, Those who dont have the free respec are forced to take a respec mission just to clear those 6slotted shields (most need 5 max, often just 4 - minor case 3).
And outside that, avoid large teams. My most teams were 3-5 players max, with a healer or a extra tanker around. Even past 22 a fire tanker for example still cant take that much beating or runs out of end in mather of seconds (even at 32 its still hard to fit all the required powers in). Likewise the stone tanker, they need to be carefull untill higher lvl.
Also, check what mobs you fight. Dont go Vahz often, dont go Clockwork without nrg-resist/defence.
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I am in the minor case of 3 then, dont care what mobs i face, 8 man team it as much as possible but try to get the best level of teamwork out of everyone as much as possible. Yesterday as my trick archer, there was double xp and i was in a high level team whose dynamics just wasnt making my trick archer very useful. If i had tried to be my debuffs would of got me aggro i'm not sure i'd of had anyone to save me, i just left after the mission, the dynamics wasnt there for me and no amount of xp would of made me stay.
When i tank i expect alot from people and try to get the most out of them. Playing in a way that doesnt try to achieve the maximum potential that can be achieved from everybodies powers at once is just wrong to me. Everything that everyone of any AT can do matters and if it all stacks at one point it can mean alot of mobs downed fast and reasonably safe.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
I have had 2 tanks with DOs post ED. My Ice Tank and my fire tank. In both I only slotted for 3 shields.
This was fine for the Ice Tank as Chilling Embrace took a fair amount of the heat off and the difference was only 4 defence and I had Combat Jumping to fill in some of that. Also he was so mobile it really didn't matter, usually I was kiting spawns.
With the Fire tank I felt unpleasantly squishy.
@Unthing ... Mostly on Union.
Fire tank remains squishy for a very very long time 
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My worst eperiences with firetanks have existed when i couldnt due to hurricane's -acc with tsoo keep all the attention, if defenders have only one person to worry about really (ie the tank) and not themselves and not other peoples survivability is made alot easier. One time i was like good atleast we have a controller/emp and then i soon found out they only have 3 slotted heal aura and the next emp power was ressurrect and nothing else after that.
As Jaqi i had Mr Cuddles as a tank and all the missions were routinely done people waited behind the herdpoint, they waited for his herding to finish, for him to consolidate aggro and then for him to say ready before they attacked and i pretty much only had to heal him which is a lot better than having to heal him, heal someone down the corridor or be required to heal several people at once who arent even going to be able to be captured in one weak heal aura. This is why i'd like blazing aura buffed for accuracy or extra tohit to enable more survivability for the team by making the firetank better at holding aggro and being the only one requiring undivided attention really or atleast maximum mobs held together for debuffage at no risk to the debuffer.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
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Fire tank remains squishy for a very very long time
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Certainly squishier than other tanks, but with SOs they are just about acceptable, with SOs my fire seems to perform better against +3s than my Ice did in I6 at the same level. I'm hoping Tough will bring the Fire tank to a reasonable point.
@Unthing ... Mostly on Union.
No problems tanking with my Invul, he's got DO's in his defences, mostly two and he's been tanking very well upto his current lvl 25. the toon has been against, oranges, reds and purples from the very low levels and has only died about 8 times so far. 
I put it down to luck! (and tactical retreats)
Agree that Vahz are very nasty and without the energy resist clocks are quite bothersome but not too bad.
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(and tactical retreats)
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When bad pulls are made or you find yourself in over your head its a lot better to back off and return rather than all die but because some heroes are completely thick and dont know when to fallback and sooner lay around wondering whose got an awaken or enjoy a nice scenic trip from the hospital all well within the time which the mission could of been done or with certainly less debt to work off its hard to get people to back off before you.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
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(and tactical retreats)
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When bad pulls are made or you find yourself in over your head its a lot better to back off and return rather than all die but because some heroes are completely thick and dont know when to fallback and sooner lay around wondering whose got an awaken or enjoy a nice scenic trip from the hospital all well within the time which the mission could of been done or with certainly less debt to work off its hard to get people to back off before you.
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This is one of the things that really annoys me, when I know that we are in over our head and should retreat and shout "RUN!" most people in pickup groups completely ignore me. Given that I try and leave 10-20 seconds for them to leave before I run, if they don't you get a team wipe.
@Unthing ... Mostly on Union.
Is it my imagination, or are tankers a bit pathetic pre-SO? From where I'm sitting, it looks like the shields aren't solid enough to keep out significant aggro (5 +0 minions is enough to put me in serious danger of faceplanting) and the attacks aren't hard enough to solo at a sensible pace.
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