In my opinion, Chimerstry has always been backwards in terms of cost. So in my house rules, it begins with spending blood points and at higher levels moves to spending willpower, not the other way around. If we have a Ravnos I can go into more detail.
There is also the problem of how convincing these illusions are? When that’s in question, I think they should have dice pools equal to the Ravnos’ Manipulation + Expression or Manipulation + Subterfuge.