Generally you dump dex and per on a full psi build.
For tranquillity generally I think the most optimal stat distribution is 10 agi 16 will 10 int with 3 in the rest by lv30.
https://cannedbean29.github.io/UnderrailBuilderRemake/?HgMDCgMDDgoAfQAAKMKgX1AyWgAFeA88AMKgRkbCoDIURsOnOSs_BSpkwodHIcOowr5XZkHCt3LCu-KdggTiorUC4qaGCt--This is how I would build TC/TM after the patch. 70 metathermics/psychokinesis are for some great support spells, exothermic aura can burn nets and webs off your character, whilst telekinetic grounding can root targets for potentially 5 turns. Ontop of this, neural overload is generally very weak early, cryokinesis is much much stronger due to its range, damage, and ability to slow targets. But if you are playing on normal then neural should suffice.
You would kill minister percival in Corecity to aqquire noble robes at lv10-14 depending on when you think you can kill him. This wont aggro the Tchortist faction as a whole so its perfectly legal.
You ideally buy some black cloth tabis from Constantine, he can sell insanely high quality tabis, usually better than what you can craft at any given stage.
These 2 tricks combined allow you to largely skip tailoring and mechanics whilst still having the best gear possible for the build.