Assuming that you're a whole wizard and not a hybrid
1. Start off with 10 Will and 10 Intelligence, then increase your Intelligence to 12 first, that gives you all 8 psi slots
2. Psi has a lot of versatility in what else you can run it with, Intelligence will grant you many leftover skill points because you do not need to invest that much in crafting, personally I prefer Agility because mobility is more important than being tough on dominating because the enemies do more damage and pierce your DT easier, so moving around is just more convenient, plus you can better make use of stealth which is seriously godly on dom, but I don't increase dodge and evasion
3. Always increase the psi skills, but personally I leave TM at 70 base points because it's just enough to learn Stasis
4. Try to get Cryokinetic Orb. It has an extreme amount of damage that can usually wipe out most of an enemy group when it critically hits, after which you could mop up the rest with a frag grenade. An imprinter is guaranteed to spawn outside the Black Crawler's base if you have the stealth for it. Alternatively you can play the waiting game and wait for Constantine to stock it (I think)
5. Only take most of the psi feats if you want to build around it, typically people specialize their psionic characters into dealing damage through one mean or two, like Neural Overload, Electrokinesis and all that, for example if you don't really want to make use of Neural Overload don't take Cerebral Trauma
5a. You can't go wrong with Locus of Control and Neural Overclocking
6. Headbands are the shit, you'll learn to love them. Use Psionic Mufflers that reduce your psi costs if you have Tranquility, or one that increases your critical damage if you have Psionic Mania
6a. You'll want to increase your Electronics and Biology for this
6b. The effects of some components like Psionic Mufflers gets augmented if you don't use an Universal Psi Modulator as the basis of your headband at the cost of only doing its effect on the respective psi school, so if you have any spells you use in particular go for it, you can probably swap out headbands given the circumstances too since they're easy to carry around
6c. Increasing Mercantile to about 120 effective will seriously improve your quality of playing
7. If you go to the Black Sea you should philosophize with the Ferryman when you get the chance (either pass his initial Persuasion check or visit him a second time to get the option), that will give you up to +15 psi capacity which also affects your long-term psi storage
7a. If you're focusing on Neural Overload the Oyetspaetter (high spiriters) and Oyensorm (the boss) carry specific staves that drastically improve its damage, especially when using Psionic Mania
8. Implosion + Entropic Recurrence is an extremely effective boss killer on dominating since many of the bosses do not have that much mechanical resistance. Assuming that you capped out your Implosion damage at 75% of their current health and have 70 TM with 12 Will (117, roughly translating to 173% damage) then with no resistances in the way you do almost triple their max health in damage, and it's not until they have roughly 50% mechanical resistance that this combo won't kill them outright, and the damage gets higher if you have more effective TM. On a boss with 75% mechanical resistance the combo will only do half the boss' health
8a. If you do this don't use Implosion with Telekinetic Proxy, or else Entropic Recurrence will simply repeat the lesser damage
9. Carry a serious amount of inhalers. With your Biology skill you should be able to make them cheaply using sponges and oxygen tanks, and that way you won't be afraid of switching out your innervated psi spells for what the situation calls for
10. Locus of Control and Enrage will significantly help you when fighting enemies, not only providing plenty of distraction where they aren't immediately chasing you but also self-damage while they also waste their special abilities like Aimed Shot or shooting poisonous bolts at each other
10a. You can get Enrage as soon as you get to Rail Crossing, the doc sells the psionic mentor
