So I got a new Thunder Jet 186 Rush boat with a 90hp Tohatsu (Honda really). Anyhoo, i had the dealer set me up with a high altitude prop (i usually fish at 4000 ft, sometimes higher, sometimes at seal level). So i definitely want to get some increased top end speed. Right now I get on plane instantly so dont mind losing a little of that. Okay, so my question is... go from my current 3 blade 13.5x15p to a 3 blade 17 or, and this is what I'm curious about... stay with 15p and switch to 4 blade. I'm thinking it may be a real sweet spot. Any suggestions appreciated.