Well it was as mastery level only granted you one warp charge per mastery level. Yes, the psychic phase works differently now. But you raise a good point.
Actually, you know wht, reading page 24 in the physical copy of the rulebook, under manifesting psychic powers:
would really seem to settle the issue and allow you to cast as many powers you want regardless of mastery level. Of course, I got shouted down when I brought this up on the other forum. But it looks like you would agree.If, after attempting to manifest a psychic power, you still have Warp Charge points left, you can attempt to manifest another power with the same unit...