How does the Tanker ATO proc work?

I've seen a few threads but was not able to follow the discussion and Paragon Wiki is very low on details.

The way I understand it, the proc has a chance to fire whenever you use the attack it's slotted in, if the proc fire you resistance to all damage types increases by 5%, 6.7% if the Proc is purple. That's a potential 20% additional res to all damages, so my Inv/SS tank would have 50% or more res to anything by Psi.

What I don't get is the how the PPM works and how to decide which power to slot it in?

If a purple proc has a 6PPM chance to fire, odes it mean that it is evaluated only every 10s? so if I slot it in a fast recharging power that foes off twice in 10s, it will only have a chance on one of those shots?

does it work like damage procs and therefore has a better chance to go off if used in an AoE? I thought I read somewhere that it's not the case.

Basically trying to figure out where I would slot either the whole set of just the proc. Since most of my attacks carry sets that grant +def bonus, I would lose that bonus if I replace it with the ATO set. In that regard my best candidate is Jab in my current build.

Also, the bonuses from the ATO sets are not that good for 4 and above. I think I would be better off catalyzing half the set and get the 3-enhancements bonuses twice, for +4% damage and +3.76% HP

the fire rate per min is just that, if you have a power that rech faster than 10 sec, it will trigger the first time but it wont trigger for another 10 sec which means you will get the bonus on every other attack if it rech in 5 sec

if the power rech at 10 or more sec then it will trigger every time you use it

it does not have a better or worse chance to go off in an aoe all you have to do is hit 1 target with the power to make it go off

as for wanting to only catalyze half the set, thats up to you, it is very possible to do it that way if you so wish

I read somethink about a "streak" behavior that made me think that hitting the proc too fast could be a problem?

More questions:

Does the proc have a to-hit check/need to hit a foe? or is activating the power sufficient to set it off?
If all you do is get the power off, using it in an AoE like footstomp means you can build your +res before engaging the enemiex by stomping the ground a few times before jumping in.

what is the duration of the +res effect? that's important in case there is a to-hit check since I want to make sure I still have 3 stacked even with the occasional miss. In that case you;d want to put it in a power that you can fire every 10s.

you're using a lot of big words that I'm not 100% sure I understand.
I think what I heard is:

- Tanker Proc (all ATO procs?) have a better chance to go off in single attacks, so don't slot in AoEs
- unfortunately all tanker attacks are considered AoEs for the purplse of the proc: bug and will get fixed "sometime"
- for some reason I didn't fully follow, the Proc fires off too often. Bug that will also be fixed.
- so even after all bugs are fixed, I should slot the proc in a power that recharges every 10/12s
- I'm going to ignore the no to-hit for Burn for now, since I'm working on my inv/SS, but my other tanker is Fire/

you mention a Streak Problem, what does it mean?

Am I wasting my time trying to use ATOs? I'm trying to get a reliable and significant (20%) increase to my non S/L resistance.

Simple, point-by-point version:

Procs with a "Proc per Minute" rating are designed to fire an average number of times per minute equal to the PPM rating, assuming that you use the power as soon as it recharges every time, and that you hit the max number of targets each time. It is based of base recharge, so slotting recharge and getting global recharge buffs will increase your PPM.

For the following examples, I'll assume a PPM rate of 4.

-First, figure out how many times you can attack in one minute, by dividing 60 by the recharge of the power. A 10 second power has 6 attacks per minute. A 5 second power has 12, and so on. Then, take the PPM, and divide by the Attacks per Minute to get the proc chance. A 4 PPM proc in a 10s power has a 0.667 or 66.7% chance of firing. In a 5s power, it's a 0.333 or 33.3% chance. If the chance is 1.0 or greater, it will fire every time. For 4 PPM, that's any power with a 15s or longer recharge.

-In AoEs, figure out the base chance as above. If the chance is above 1.0 (100%), do NOT round down to 100% yet. Divide the chance by the max number of targets to get the chance to proc. For the 10s attack, if it were a 5-target AoE, its 66.7% chance would drop to 13.3% per target. The 15s power (which gave 100% chance as a single target) would only have a 20% chance per target as a 5-target power.

-To figure out the recharge needed for 100% firing, divide 60 by the PPM, and multiply by the max number of targets. For a 4 PPM proc in a single target attack, that's 15s. For a 5 target attack, that's 75s, or 1m15s.

-There is also a calculation that adjusts based on the size of the AoE, but we weren't given exact details. We know that certain small AoEs, can get a 100% proc rate, even though their recharge doesn't appear to be high enough based on the above calculations.

The bug that Necrotech is talking about is caused by the system automatically calculating the chances. If ANY PART of the attack is AoE, then the proc calculates the chance based off the largest number of targets. All tank attacks have Gauntlet, which is a 5-target AoE taunt. Because of that, all tank attacks are treated as having a minimum of 5 targets (more if the power typically hits greater numbers); no tanker power is calculater as Single Target. This is a huge disadvantage for Tankers, as it makes it harder to keep the proc in effect at all times.

PPM for dummies (as I understand it):

The proc chance in PPM procs varies by the power it is slotted in.

A 4 PPM proc will have a 100% chance to proc in attacks with 15 second recharge (because 15 sec x 4 = 1 minute)

A 4 PPM proc will have a ~50% chance to proc in attacks with 7-8 second recharge.

The bigger the recharge time, the better the chances of getting the proc to go off. This was made to slightly balance procs. The original ones favor quick recharging attacks too much and the devs wanted to correct this, at least a little.

AoEs is another level of math I think was explained up there, but I'm still figuring out.

is the fact that the odds are calculated on base recharge as intended or a bug?
if the proc is 4ppm it will fire 100% of the time for a power that recharges in 15s, what if I have enough recharge to use the power every 10s? it will still go off every time? this would help in case I miss for example.

of course the tanker one only stacks 3 times so if it were to be reliable (fix the gauntlet problem) it would be overkill to fire it off every 10s? (I still don't know how long it lasts)

I'm starting to feel that ATOs are a rotten deal for VIPs, especially the non-procs. maybe of interest to people that don't have access to IOs.

I still feel that there's more to the AoE formula aside from dividing by max targets. Like I mentioned before, I'm using the SoA proc in a cone AoE and it triggers very often. Much more than I would expect from a 10% chance as the formula would suggest.

Also, I threw the other 5 into a ST attack for the awesome purple set bonuses which allowed me to make some adjustments in my build that I've always wanted to do but couldn't sacrifice in other areas. All is well over in SoA land with these ATOs.

I sure wish I knew the exact formula for PPM in AoE though. I'm considering switching out the Posi proc in my AoEs for the SBE ones if the overall proc chance was higher.