I'm mostly doing the mechanics+electronics both so I can make flashbangs.
I want metathermics to be a 2ndary source of damage output.
If I could get a confirmation of something like "persuasion 100 (142) will grant you access to all dialogue options that have a skillcheck for persuasion" for the current version, I'd have a point of reference.
Just three more points here since it looks like you either don't know what I'm saying or don't care, and if it's the former I need to clarify. If it's the latter, feel free to skip this post =)
1) If you're mostly just doing crafting for flashbangs, then you obviously need to drop the Bowyer feat, and also have a few too many skill points already in the skills. Pull out points until you have 40 effective Chemistry and 5 effective Mechanics. Put all the points you've freed up into Metathermics, because...
2) With 99 skill, Metathermics won't
be a secondary damage source. You've picked up Thermodynamicity, which means unless you're wasting feats, you intend to do things like open with Cryokinesis (20AP since you don't have Tranquility), follow with a faster Pyrokinesis (17AP) and then do shooty pewpew stuff. You've also got Pyromaniac which means you're hoping your Pyrokinesis will set enemies on fire. It won't, at 99 skill. See, extra effects like burning are resistable. Enemies resist extra effects via Resolve or Fortitude (Fort for fire). Their resist are overpowered in large part by your effective skill with your psi ability. So at high enemy levels in the later game, 99 effective skill means you'll often not set enemies on fire because they'll resist your secondary effects because you don't have the skill to suppress their Fortitude.
You'd actually be much better off dropping Pyromaniac and putting 30 raw points into Throwing and picking up Grenadier - you'll already have the Chemistry for cooking flashbangs to cook your own improved incendiaries, and they'll do better at setting the world on fire. EDIT: Bleh, I'm going to bed. I switched your Dex and Agi scores in my head when writing that. You won't have the Dex for Grenadier so ignore that part.
You also need to get Premeditation. You just need to. If nothing else, you Premed your Cryokinesis, take it for 0AP, then get a Thermodynamicity proc on your Pyrokinesis, and have done a targetted shot plus a fiery AoE for 17 total AP. Or switch it around and get the extra range and 0AP on your Pyro and chill someone if they didn't catch fire. Whatever.
3) According to destroyor's FAQ, which seems to be highly accurate, there's no Persuasion skill check in the base game higher than 110 effective. Unless someone with some deep knowledge comes down and calls me out for being wrong, I'd suggest you go ahead and trust destroyor's FAQ. It's very thoroughly researched and probably about as solid as you'll get without access to the actual game files. So get your effective Persuasion skill to 110 and you'll be good for the base game. Given that skill checks are always -
thus far - a bit lower than the raw skill cap, you might be okay keeping effective at or under 150 in the expansion content. Might be.
EDIT: Oh, epeli suggests capping. Well, he's one of the people who knows way more than I ever will about this game
Do what he says, it's probably right.