I just got off the phone with Todd at Hydromotive, i told him My set up he said that i was around 17% slippage. I have the bravo 32' on my boat not 30's. He thought that i should go with P5X's thought it would give me a better top end and better midrange. He also stated that he was doing some testing in Florida this weekend on a Similar boat. Is this the type of prop that you have. Call me if you can 608-221-0000. ask for Ed