4 blade stainless will get you out of the hole quicker I bet. A 26 will cost you some hole shot but will improve your top end speed. A 22 will pop you up quick but you'll be 8 mph slower.......You also don't want to over rev the motor....you may need to expirament.
It really depends on what you want. Ski/boarding/ better hole shot or best top end.
What do the other Tremor owners run....? You might want to start a thread asking 25 Tremor owners specifically....