Have a 1996 Bass Cat Eyra with a Mariner 175 EFI. It turns a 25 Tempest 3.25" below pad about 5900 rpm at 69-70 mph but is a nasty handful to drive above 65 mph. I recently was given a 23 pitch A41 Trophy (large hub) and tried it to see if it would handle any better and have been disappointed in both holeshot and top end. Prop ventilates terribly while getting on plane and runs 63 mph @ 6400 rpm. I've run small hub trophys on other hulls that didn't ventilate this badly. I'd hoped that the Trophy would help holeshot and make the little Cat a bit easier to drive on the top end. Any suggestions as to height below pad, anything?