i'm running a 15p, 10.25" dia stainless ballistic prop on my zapcat with a 40hp mariner, all up the whole package weighs about 170kg, its running at 46mph flat out. i ca get the prop tweaked/worked as in upping the pitch to 16/16.5 what effect will this have on my speed? i'm trying to crack 50mph with it! i'm ordering some reeds from chris carson and ii've lightened the flywheel by about 2lbs. is it worth working my prop or just look for another?