rpm's down
 

Hi there , had my 21p mirage look over at the prop shop and check out fine he also put a more cupid in the blades too .. my rpms have dropped from 4500wot to 4100wot and picked up 3 mph . when i trim my 90 24 formula [ heavy] , it seems to have less upward trim before it begins to start to cavitate is this due to what was done ?? any advice thanks :boat:

I'm sure it is. Have you talked to the prop shop that did the work?