I'd rather the four psi schools scale half or fully off of different base stats, and perhaps reduce the synergy.
I'd like to applaud this post. More than just by clicking the button. At least somewhat benefitting from different attributes would also allow psi characters an easier sidegrade into other options;
right now, you either use it as a little bit of support, or you go all out, excepting low health crit builds.
Promoting some variety from within the system would certainly help. Maybe innervation could be a more costly affair, but you can still cast everything else at a higher cost out of combat?
I'm personally not against adding more equipment slots for psi users;
Gun users can have a belt to accelerate reload or boost chemical warfare, 2 weapons with viable crafting options to specialise, they get goggles with a variety of effects, and their armour can also provide bonuses - on melee characters, you still get all those equipment slots to allow bonuses for your playstyle, only you can also use your armour to directly boost offence, and add the boots into the mix, too.
Psi only gets headbands and crafted armours. There's certainly room.
I mean, what weapons does a psyker currently use? There's a knife that reduces chance to be critted, a knife that boosts lockpicking, gloves to increase strength to be able to wear crab armour, and if you like TC, sormibaren spears. Which all happen to be unique, or close to it.
I do, however, also not believe that adding invoker gloves would fix the underlying problem, if any.
However, it needs to be something that purely provides utility boosts unless Styg actually wanted to nerf hybrid characters. (I do think there needs to be another feat or two for non-psi, though. I mean,
who does that?)
Psi abilities are also more similar to special abilities than weapons, only you get more abilities and no "standard" attack.
Why not give a sort of weapon that allows a low psi cost, no cooldown base attack, with accuracy based on one of the disciplines, and (potentially craftable) bonuses along the line of "+1 Innervation slot", "-10% [school] skill, -5%-15% [school] cost", "killing an enemy with a single target psi ability refunds X psi points, to a limit of X% skill cost", or "+1 range on [school] abilities"?
Just brainstorming.