Dan,
The one thing that I had happened with my rig was when I switched from a Tempest 24p to a trophy 24P I was getting extreme blowout on hole shot, regarless of plugs being in or out. I spoke to some local motor shops around town some mentioned about a blowout ring aiding while other said it would only make things worse. After embarrassing myself during 2 tournaments, plowing for 15 secs before coming up on plane while other blew by me, I bit the bullet and spent the $13.00 on this blowout ring. It was night and day. The ring was the ansewer to the holeshot. Still not 100%. So without dropping to a smaller pitch for better grab I elected to try relocating my batteries (Fairly simple to do). Not sure if it was the right thing to do, but it is amazing now. I did not want to go to a 25p for fear that my holeshot would go to the dogs again. Right now I get about 63-64mph with a tempest 24p. With my Trophy 24p I was only getting about 61mph. I went back to my tempest after relocating my batteries, and my holeshot still performed perfectly. No porpoising down as low as 13mph. If you don't think a 25p would kill anything, ie.top end. I'd be willing to give it a try. Would like to put my batteries back to where they were, can use that extra storage space. What about going to a fury prop??? Less flex, better grab???