Another thing I'd point out in general is that as more books come out for an edition, most of the time, less comp is needed. 8th edition fantasy got better as more and more books from 6th and 7th got replaced.
I'll speculate that the new Dark Eldar & Necron books get cool anti-psyker wargear, as those two factions seem to have fluff to support it.
Dark eldar can get more psykers than orks right now.
On the whole psy phase, I think people need to really try it out and play with it more before changing anything. I have had two games so far. In the first I had 7 levels of psykers with my blood angels vs 4 levels of IG psykers. One the whole, my psykets were able to successfully manifest half the powers they used to. Mephiston was still very scary with biomancy, but his buffs weren't guaranteed like they used to be. The second game saw my 5 levels of IG psykers vs. 30+ levels of demons. Yes he did summon a lot of demons, but he was focusing all his dice on it. The buffs and wichfire powers that demons rely on were ignored. As a result I was able to fight him to a stand still. The game ended with a 1 point victory for me, thanks to massed pie plates (tank commanders are fantastic).
The point of my ramble is to give it time and try it out before you start restricting things.
Oh ya, invisibility is completely broken.