I have a 19' aquasport and a 150 crossflow that will not get more than 5100 rpm at wot moderate load. Compression is 80 to 85 on entire motor lync and sync is correct, timing set at 28, plugs are tan when checked right after a wot run, carbs are 1" bore 83 150 carbs just soaked and rebuilt. The motor runs and idles great. AV plate is about 2 inches above the bottem of hull. 15x17 Alumnium prop 42 mph Prop ventilates slightly during holeshot then settles in nicely. Not to much trim needed for top speed. 30psi water pressure at wot.<br />My question is what next? I cannot understand where to go from here. A 15 pitch prop seems way too small for a small boat.