I think it's something that's inherit with Skeeters. I'm probably way off base but before the sponsons Skeeter's wouldn't do that. I had a 92' 175SX and I could go as slow as 20mph without it porpoising. I've had Ranger's and Bass Cat's and neither had that problem. I'm now in a Skeeter ZX190 and it will under 30mph and just about everytime as you come off pad. It's called the " Skeeter slap " LOL.
The sponsons were supposed to do three things for the boats.
1. Fix the backwash problem coming off plane by adding more flotation at the rear of the boat. Skeeters were notorious for this in the past. I recall the first Skeeter I ever saw with the built-in sponsons. I've gotten used to it now but it was not attractive to me.
2. Improve holeshot by diverting the water downward as the nose lifted during holeshot.
3. Minimize porpoising by adding more downforce to the nose as the water comes off the pad of the boat.
Those were the claim to fame according to Skeeter when they changed the design years ago.