The game went much smoother without using AHI.
Haven't confirmed yet if 16bit screenmodes are faster ;-)
Next thing is to try it on my Mediator setup with the tips I have got here, have to play some more with my A1200 PPC setup first.
My damn, low quality piece of crap CD32 controller's red button is almost dead, I almost have to sit on it for it to work so I have to start looking for a Competition Pro CD32 pad..anyone have one for sale? :-P