bassboatcentral is now bbcboards.net. Go to the props forum with your info such as what boat, horsepower motor & wide open throttle rpm & gps speed &they will get you dialed in. Mark Croxton the prop guru is one of the best there is period. He also has his own line of props called Razor & they have been outstanding. Ask him or 21 XDC(Mike Lohn), they'll take care of you.