ATM I have a 14.25x17p 3 blade SS prop WOT i'm running 5k RPM, and max speed is around 43 MPH. I'm thinking I may need a 19p pop which bring my WOT down to around 4800 rpm which should be more correct, how much more speed do u think I'll get out of it? BTW: if I did this, I'm gonna get a 4 blade...