I sort of experimented with taking Psi Empathy and JUST Temporal Manipulation with the Temporal Distortion, Limited Temporal Increment and Psycho-temporal Dilation skills from Ethan and frankly I couldn't figure out whether I should debuff a few times or just go slashing with machete. I used some Psi beetles to try it out. I was confused by a new set of abilities how to mesh them in with a Melee Sword. Also the lower health pool wasn't great.
Any advice for how and if I should integrate this skillset? I have been putting points into TM (only TM in that tree)
Psi is a package deal. It's sub-optimal to JUST invest in TM at the cost of 25% health.
Psychokinesis:
25 Force field - always useful when you need to block or separate enemies or wait out cooldown
30 Electrokinesis - guarantee stun unless target is immune to stun at a high AP cost and makes a lot of noise
45 Electrokinetic Imprint - psi trap that stun for 1 turn
Metathermics:
35 Cryostasis - freeze target from 2 to 5 turns at high psi cost. *important* it's silent
Temporal Manipulation - just want to comment Stasis is very useful to turn yourself as bait in order to waste enemies' special attack such as flashbang (8 turn cooldown), Mental Breakdown (8 turn cooldown), throwing net (4 turn cooldown, make sure you eat rathound BBQ + take adrenaline before entering stasis). It's also useful to wait out cooldown
All of the above are invaluable crowd control skills. You should get them all or avoid psi altogether. I don't know about your build but psi hybrid usually will have 6 INT in order to get Premediation.