hydro shield?

[Fr. Frank]

Original question was about the HydroShield. No, this amazing device will not help the tendency of the 25 to want to bank like a fighter jet in the slightest turn. But yours sounds like it's gone from being nimble to being downright twitchy. One is fun, the other gives you a tired set of Kegel and gluteus muscles.

I think several people here are on the right track with addressing the CG, both vertically and longitudinally. If you run with just a couple of degrees of down tabs on both sides it will help tremendously. Even when the hull leans/banks in a turn, it will quickly return to upright when the vessel is once again going straight. How many degrees of tabs you'll need to run you'll have to figure out on your own.

The only 25' I've ever worked on and had to block up was a twin stern-drive model, and with full fuel it had a longitudinal balance point about a foot behind the cabin aft bulkhead. It did have ballast bars below the cabin floor. We ended up putting two keel blocks under here plus two Brownell stands.

By contrast, my current '71 Seafari 20' with 140hp sterndrive balances fore and aft just 8' forward of the transom with no fuel. (I've never blocked it with fuel in the tank).