My theory why Paul used FD3 and Monster instead of FireBird is the grip: The powergrip is more comfortable with wide rim discs (IMO). Paul uses powergrip instead of stack grip with forehand. FD3 rim (and Monster as well) is wider than FireBird's.
Paul also used to throw Destroyer on really short forehand hyzer shots. So I believe it's all about grip and comfort.
Paul also used to throw Destroyer on really short forehand hyzer shots. So I believe it's all about grip and comfort.