You don't need aid self and tbh i don't know where you'd get the free power slots for it anyway.
Theres no equal scrapper set to /nin so no, the only close one is SR and 31% is not even close.
My nin/nin solo's fine without aid self.
/nin or /sr .. personal choice tbh
Defiant's GoEH/MILITIS METUS
I'm currently levelling my Nin / Nin Stalker, and apart from the problems of mayhem missions, I'm doing quite well with quick, vicious attacks to keep a good chain going.
I've taken gamblers cut, slotted it for recharge, damage, accuracy and endurance use, with the two main attacks, soaring dragon and golden dragonfly to use with it/ GC gets thir defence down, the others add the damage and inflict knockdown to keep me going without having to self heal so often.
SD > GC > GD > GC > SD > etc.
apart from that, ive gone for stamina, swift and health, assault to add onto AS, combo'd with build up and general fighting works well.
I'd recommend perma'ing Kuji-in Rin for Mez protection, but be warned, its not as effective as Practiced Brawler as it doesn't protect against as much if memory serves.
In-game and now on Twitter @Tsumiju Zero "The Nightmare of Dra'Gon"
"The flow of battle can only be influenced, not by realtime tactics, but by strategy."
Proud resident of the Union EU Server.
B.A.F. Trial Guide
ouch !
Good luck with that build, i mean it.
Kuji-in rin is the same ,read my lips 
, the same as practice brawler in recharge,mez protection etc etc.
The one thing it dosn't have is KB res altho it has fear res which PB does not have.
Defiant's GoEH/MILITIS METUS
aah yes KB protection, I knew there was something it was missing and that was it!
As for "ouch" it seems to be a pretty effective build, ok, ignoring the inherant stalker ability to not be able to do mayhem missions, or anything involving hostages...
I've not read many guides on stalkers, I've just gone with what I've found effective and it seems to work!
In-game and now on Twitter @Tsumiju Zero "The Nightmare of Dra'Gon"
"The flow of battle can only be influenced, not by realtime tactics, but by strategy."
Proud resident of the Union EU Server.
B.A.F. Trial Guide
I think i know what you've tried to do .. you think your not doing enough because gamblers cut is min damage and your using assault to make up the difference.
Thing is you could drop gamblers (min dmg) and pickup flashing steel or sting of the wasp (medium dmg) and would do alot more dmg with those than gamblers.
Secondly assault with the 2 /nin shields would be a huge end drain resulting in you not being able to scrap for long.
Even 2 slotting the shields and 3 sloting assault they would be using .567 end a second .. hardly worth the 10% extra dmg .. and thats to base dmg not enhanced damage.
You'll be lucky if you get an extra 5 to dmg.
Now you can say 'Chels shut up i like it!' 
and i'd understand but i just wanted to give you other options and figures to help out.
[Edit] just looked on my builder and AS is 19.4% base dmg
with assault it would be 20.9% so you've gained a whole 1.5% dmg.
I'll let you deside
Defiant's GoEH/MILITIS METUS
hmm, well I went with gamblers cut because I found the nature of stalking to be hit and run, quick attacks. I found sting of the wasp to be too slow for the purpose of constantly attacking when unhidden.
My attack chain consists of the two big Ninja Blade attacks, Soaring Dragon and Golden Dragonfly, inbetween which I redude the targets defence with Gamblers Cut.
The knockdown / knockup of each of those big attacks keeps most one on one's under control, but if things get hairy I can placate and use Kuji-In Retsu to heal then wait and start again.
As for assault, I took it so that all of my base attacks had a little extra edge to them, but mainly to add on that little something to assassin strike, as well as providing a benefit to the rest of the team. I've got a single end reduction on each shield, assault and most attacks, and with 3 slotted stamina I can keep scrapping away, and again, if things do get iffy I can placate and recover.
Appreciate the input, I'm actually keen to hear what you reckon on the above 
In-game and now on Twitter @Tsumiju Zero "The Nightmare of Dra'Gon"
"The flow of battle can only be influenced, not by realtime tactics, but by strategy."
Proud resident of the Union EU Server.
B.A.F. Trial Guide
Oh yeah fair do's you have a different play style to me.
I like to AS the biggest threat and then scrap away with the brutes to help out as much as possible so my build is alot of damaging attacks like flashing steel,sting of the wasp and SG,GD and divine to boost defence plus other tricks if i need them.
With my shields 2 slotted with end reduxs and attacks with 1 i can scrap till the cows come home.
A travel power,concealment,fitness and speed pools(for hasten) it dosn't leave me room for anything else.. not that i really need anything else.
BTW all Ninja blade attacks lower defence the question you need to ask yourself is would you be better off with a min dmg attack or a medium dmg attack as there all roughly the same speed animation wise.
oh yeah i was wrong in my figures before 1 slotted shields and assault would be 0.952 end per sec were as my build uses 0.559 end per sec.
You can see who would run out first.
Thing is with stalkers 9/10 times you'll end up having to scrap something.
Mayhems are a good example as the mobs just zero in on you and you end up having to scrap so my thinking is its best to be able to do the job as fast as possible but if i need to stand and fight i can.
One piece of advice i will give you tho and i do say this often to my sg mates is think of your toon first then the team !.
Its no good if you can't do your AT's job because you've got alot of team assisting powers unless your on an AT whos does that but basicly your melee AT's should think of themselfs first.
No names mentioned but the dark/dark brute with all the medicine pool and only 1 shield springs to mind 
You know who you are ! lol
Defiant's GoEH/MILITIS METUS
Mayhems are bloody good examples, I always end up having to scrap stuff, and when I had sting of the wasp it just felt like there was too much of a gap between attacks that enemies could get through, so by switching to gamblers, yes I lose some damage, but I just found I could go from one attack to the next a bit quicker, keeping the pressure on my opponent.
You're quite right on thinking of yourself first, the main reason I took the tp pool is that the stalker is the obvious choice to get the team around missions and zones with less risk, but it does also allow me to draw allies to me so that when I do hit that soft target, im not alone!
In-game and now on Twitter @Tsumiju Zero "The Nightmare of Dra'Gon"
"The flow of battle can only be influenced, not by realtime tactics, but by strategy."
Proud resident of the Union EU Server.
B.A.F. Trial Guide
Ahhh right your talking about the recharge on attacks.
I'd defo take hasten to fix that problem then slot your attacks with 2 acc 3 dmg 1 end redxs
Then you won't have a problem with end or recharge.
Defiant's GoEH/MILITIS METUS
I think there is a cap on the number of pools you can access at once ( well I always thought there was ) so i didnt want to take loads of powers from different pools and screw myself up!
plus i dont like relying on click powers, its always when youre waiting for it to recharge that you get ganked!
In-game and now on Twitter @Tsumiju Zero "The Nightmare of Dra'Gon"
"The flow of battle can only be influenced, not by realtime tactics, but by strategy."
Proud resident of the Union EU Server.
B.A.F. Trial Guide
yeah only 4 power pools and hasten is pretty much standard on most of my stalker builds its good for bringing the attacks back quicker and heals and your all important lvl 38 power.
Defiant's GoEH/MILITIS METUS
My nin/nin was a total pain to do anything with, but having got up to the late-teens and twenties she seems to have matured and has got a lot easier to solo with. She doesn't even seem to have that much trouble with Mayhem missions.
Disclaimer: The above may be humerous, or at least may be an attempt at humour. Try reading it that way.
Posts are OOC unless noted to be IC, or in an IC thread.
Stalker solo build -
Katana/Nin [ok i know its not katana...]
Getting the self heal aswell as aid self...
No silly "epic" pool, just stealth n random powers
Will fit in acro somewhere
And divine avalanche before 30,
questions.
Can i solo? [31% def, same as SR scrapper]
Can i solo without aid self?
Would it be better to go Katana/SR [38.9% def]
Cheers