5 in Str doesn't really worth it. You are going for Steadfast Aim and even after buff (very slight buff mind you), it's not a very good feat, especially now that laser pistols are 15 AP per shot, meaning that they are going to be your primary weapon and they don't really get much out of that feat. Also you should aim for 14/15 Dex eventually (and you are not gonna get it with current build), since it will get you 5 attacks per turn with lasers and that is really good. I would recommend leaving plasma alone, even with buffed damage it still has bloody 40 AP per shot, which makes it mostly gimmicky weapon for making screenshots of big numbers when you do critical hit on execute. Aimed shot from Electroshock Pistol with smart module and amplifier is a very good way to start a combat on the other hand.
No reason to max persuasion and mercantile. Check the wiki or destroyor's guide on steam for thresholds on those skills. Stealth is a must, you are not a tanky build (5 con and riot armor aren't gonna cut it) and without stealth you are a sitting duck, so unless you like to reload a lot, i would suggest putting considerable amount of points in there. I would also take points out of con and put them into Agi and invest in evasion along with stealth. That would be a better choice for overall survivability.