I have a 21 Spectra with the bottom reworked and the strut moved forward. Has a 10 in. 15 pitch 3 blade with a blown 572 and 52 gears, just 'melts' the prop from a dead, don't have much clearance under the boat for a bigger diameter prop only about 1/2 to 3/4 inch clearance from the bottom of the boat and the prop ear. Suggestions ??? Need something with more 'bite'. From 50 mph up the boat drives great, handles great and goes triple digits no problem. Just need it to 'hook up' better when I punch it at lower speeds.