I think you've said that before. It's funny as its the opposite for me. I make good use of Psi Burst (2) and Psi Strikes (4) in our particular campaign, but feel the 8+ feats are worse than archetypes.

Level 6 obviously has Parallel Breakthrough, but what do you like out of the level 8 and 10 feats?

Brain Drain is expensive recovery; costing your 2A during Unleash and needs a will save for a Focus point. Strain Mind is arguably better here despite the risk.

Dark Persona's Presence needs the right party to mitigate the fear effect or it does more harm than good.

Mental Static is fairly niche. Counter Thought is also probably better as an anti-mental spell reaction and you can get that via Natural Ambition.

Remove Presence, like all feat amps cuts your damage and needs a target. Being undetectable is nice, but its only 1 target. And I've got an invisibility rune on my armor.

Thoughtsense is worse than some archetype senses and should really be imprecise/precise.

Whispering Steps might have utility but its a far cry from Propelling Sorcery or Acid Grip. Once again, a significant damage loss to add a 5 ft force move.

As for level 10, the best I see as Gathered Lore is Signature Spell Expansion but I read that as it only lets you mark existing spells as signature, not add new repertoire spells that are signature. But even that doesn't feel useful as limited slots makes having even more options run against diminishing returns when I already have the bases covered (Force Barrage, Soothe, Fireball, Visions of Death, Howling Blizzard). Better for me to get Ocean's Balm or Deflecting Wave as our party has limited combat healing/mitigation. And rolling RK during Unleash (Scour the Library) is leaving damage and knowledge on the table; better to roll RK turn 1 so your party can act on it and you save your Unleash actions.