Razakai, for predator I'd love to do a more "bestial" styled blood tree.
As for a sustain, sustain, passive, passive, sustain, what's the difference to Cursed? But yes, a mindpower increasing talent of some sort would be of great use to Cursed, especially since a majority of their talents and trees focus on physical power with the exception of Gloom.
Overall Razakai, I'm liking the 5 minute sketch. Surge could be renamed and fill the mindpower niche while the 4th talent gives a bonus for switching between forms because they are still mutually exclusive, yes? As a result there should be some bonus for switching between them, even if they all do serve a different purpose. Something like...
Switching to Deflect grants projectile slowdown, increased armor and defense(relatively useless?).
Switching to Cleave grants phys power, bonus attack speed and bonus movespeed(incredibly similar to rampage, needs refining).
Switching to Surge(or whatever it's renamed to) grants temporary mindpower and enchances gloom's effects by x%.
All of these effects (except for maybe Surge's) are a little boring so I'll probably come back later and fill them in with something a little more interesting.
A little bit of a starters guide written by yours truly here