To keep it short, a lot of the psyker feats are interesting but not powerful enough to be viable, and small adjustments could be made to them to allow for much more interesting builds.
Tier 1
While Quietitude is generally the best, the other 2 are still decent and useful in some scenarios, only small buffs needed if any. A funny buff for Essence Harvest oriented towards new players would be when you overload, you lose one wound of corruption and explode but are not downed.
Tier 2
Psykinetic’s Wrath - Rename this perk so it doesn’t have the same name as the class ability and buff the percentage at high peril to 20-25% to let it help some builds reach important breakpoints as a reward for keeping high peril.
Wrack and Ruin - While cool and flashy , 2 stacks of soulblaze isn’t even enough to kill poxwalkers, so it is worthless. Increasing the stacks of soulblaze to 4 would help, as well as having this effect apply when an elite is killed with any force attack, to synergize well with the Force Sword.
Tier 3
Cereberal Lacerations - Not terrible, but can’t compete with the other 2 great options in this tier. An increase in the damage taken, and potentially highlighting the affected enemy in a special color would help teammates know that specific enemy is more vulnerable.
Tier 4
Kinetic Deflection is an amazing and versatile skill, meaning the other options have to be pretty good to ever be chosen.
Kinetic Shield - This bonus should apply to all toughness damage received and should also increase toughness regeneration speed by the same percentage.
Mind in Motion - This perk is rendered obsolete due to some blessings (Transfer Peril) and at the very least could allow you to sprint and slide at normal speed while quelling and give a small quelling speed buff.
Tier 5
Kinetic Overload - Applying a weak few soulblaze stacks to a random nearby elite is much worse than what the other options offer, so at the very least it should apply the soulblaze stacks to all nearby in a wider radius.
Tier 6
Quicken - Generally not that necessary or interesting compared to the other perks. If it gave a bit of toughness for each warp charge expelled, or even a burst of movement speed, that would make it a good durability-based option.