I picked up a 29 promax over the winter and finnaly had a chance to run it.Im running a 250xs on a pro 2 seater.with power poles..mid range through top end this is the best prop ive run so far , the problem is the whole shot, it vents to much..i have solid plugs in all 4 holes..it revs to 4600 rpms before it bites..this is a loaded boat 2 peiple 500lbs, full load tackle and full fuel..Is there something i can do or have done to take care of this? thanks for any suggestions.