these labbed 15x30 are a pain to get on plain.was thinking of switching to some 4 blades but right now i need my motor running more than anything

My boat just wont run right with 3 blades, I need the 4 blades for extra stern lift. I'm looking for some 26p or even 27p Hydros to keep the same speed (85 max) while lowering the rpm's, I just dont like spinning them that high.