I have a 1994 Blue Wave 165 super T. I have a hi-jacker manual jack plate and a 90hp yamaha inshore. I also have a Permatrim plate on it. I just installed the plate and did loose about 1kts and 100ish RPM which I expected. I currently have a 13x15 amita 4 blade. I can only get 4400RPM sometimes 4600 depending on load. I'm only running 21kts at 4k and 25kts at 4400. I feel a 13x13 would be to small but I've got to get the RPMs up into spec. I know tunnels are a different beast but I have tried several different props. 3 blades are out of the question as I blow them out super easy. Any help is appreciated, I'm about to put my 140 jet on the thing lol.
