You should be able to cap with Booster (-2) and either Transfig (-2) or a full Transformation Gauge (-2) (-1). The speed boost from either Transfig or Booster isn't being applied while you're in the transfigured state, though, so you won't be able to hit the speed cap transformed right now.
Anyway, all things working correctly, you shouldn't need increased attacking speed from IA for a Kaiser, at least not when you're transformed.
Anyway, all things working correctly, you shouldn't need increased attacking speed from IA for a Kaiser, at least not when you're transformed.