In order of decreasing preference:
Thermodynamicity - Tran psi w/ psi cost reduction gear can spam ice + fire combo wiping everything in one turn.
Pyromaniac - for those sweet fear effect, very effective when combine w/ Thermodynamicity.
Meditation - a tran psi's limiting factor is psi pool, more psi = more psi ability spam.
Neural overclocking - just because you are going Tran psi route doesn't mean your psi won't crit.
Power Management - not as important for psi since you can just CC everything, but a bigger shield is always a plus.
As for the specialization points:
Exposed Weakness is ... questionable in this build. But if you are set on getting it I would get exposed weakness duration +1.
Hemopsychosis cooldown is what I would go for. But I will admit your build as is these two choices isn't *that* much better than 5 SP for disassemble.
My problem with Thermodynamicity and Pyromaniac is that both are heavily random.
Pyromaniac is literally 50/50 coin-flip, Thermodynamicity requires some form of fire-based psi, and those either don't combine with ice (Thermo Destab), have intrinsic miss chance (Fireball) or are just plain too situational (Pyro Stream).
On tranquility psion I rarely find it optimal to alternate between fire and ice. 95% of the time I would prefer to either just spam ice, or use something from psychokinesis and/or thought control. Getting a good AP cost reduction on something I don't actually want to do most of the time (alternate between fire and ice, that is) is redundant.
But at any rate, you can just swap Thermodynamicity in instead of doctor (which is already a meme feat in that build).
Pyromaniac is simply not good if you are not willing to reload when it fails to proc at the critical moment.
Meditation with +psi pool feats and equipment from expedition is now 100% redundant.
Neural overclocking gives a tiny increase in actual damage on tranq build (completely unreliable, procs rarely and when it DOES proc it often just overkills, since the target would have died from normal crit just as well).
Power Management for larger shield size is QoL, since 99% of the time you don't actually try to face-tank damage for several turns in a row.
As for Exposed Weakness, that's just a meme feat for insta-kill combo with cryogenic induction and implosion. So duration on it is completely irrelevant, nothing will ever live for more than one turn when exposed.
TL;DR: Thermodynamicity might be ok (even if I don't find it useful for my play-style), but you can swap it in for Doctor. Everything else is either unreliable or redundant.
