then at 20 I'm thinking I'll put another point into Dex to increase Lockpicking + Traps
and then use spare skillpoints at 20 to pump up metathermics 108 (163)
are there any statchecks in the game?
Your lockpicking and traps are actually quite solid as you are. You probably would see more benefit from either Will (for Psi) or Perception (for Crossbow). As an aside, if you did intend to put your stat points from 20 and 24 into Perception, you could fre up a feat slot since with 10 Perception you don't need Snooping.
You already know I approve of investing a bit more in Metathermics in general, but without Pyromaniac you're missing out of half the fun of the school
You can't set stuff on fire with Pyrokinesis, Pyrokinetic Steam, and Thermodynamic Destabilization. And lemme tell ya, setting stuff on fire from the corpse explosions of ThermoD is tons of fun
Getting your effective skill up into the 160 range means you'll overcome enemy Fortitude relatively often and might have reason to consider Pyromaniac if it sounds interesting.
Lots of stat checks. You'll be OK for most of them with those stats. Early on in the game you should wear Cave Hopper leather armor and boots to make the Agi checks in a few places.
You're still overcapped on persuasion. If you took 10 points out you'd still be able to make every Persuasion check in the game. If you put those points into Chemistry instead, you could cook thermite grenades. Don't tell me that doesn't sound
a little bit fun at least.
If you carry around the Jackknife, your current lockpicking and traps will be 130 at level 25. That's also enough to pick every lock in the game. Eat a Dex burger and you get 129 at level 20, just in case you're not planning to level cap. And of course you can always use an improved lockpick to cover that one point gap.