I have a 2000 32 active thunder with 500 hps with a refresh to about 560 per side, my original prop is a 30 b1 labbed heavly, verry thin, i am now getting into the rev limiter at 5500 it runs 86 on gps up 3 mph from last year,so i tried a stock 30b1 only spun it 5300 at 83 mph but made the boat porpoise bad on top end, then i tried stock 32 b1s with a cupp in them im told to about a 33 only spun them 4700 at 83 mph but again porpoise bad on top end but did pick up 5 mph at 4000 rpm, my original props do not make the boat porpoise at all. im lost what to try next.

Check your PM's. I've got something you can try!

Dave