Also you might not yet have reached a decent motor height. 8″ below the pad, if that is an accurate measurement, is _Wayyyy_ down there. 4″ is getting close to home. But motor height and prop interact significantly. Some props will not run high. Not enough cup, poor blade shape, poor rake, etc. Dont know enough about powertech to say anything useful.2008 Pantera Classic2014 Mercury Pro XS 200