I have 96 SS90 with Yamaha 75 hp, actually I can reach 33 mph with Comprop propeller 4x13.5x15 pitch @5200 rpms (wot), before it was running 34 mph with aluminum propeller 3x13.25x17 pitch @5400 rpms (wot). What could be the maximum speed that I can reach in my boat ? or am I actually running it in the optimal range ?

I really appreciate comments.