I recently put on shoe and ride plate kit from Hi-Tech on my berk "e" pump in my Sanger 20.5 Mini-cruiser.
The idea was to cure the nasty porpoise I have at mid range speeds. I still have the porpoise, and I now have some handling quirks when letting off the gas after a high speed run. As I let off the gas, the boat will get very squirrely and try to turn one way or the other.
Is this caused by the shoe? The shoe has no shims under it, and it is roughly even with the rest of the keel due to the recessed nature of the "e" pump installation.
Do any of you pump guru's have some thoughts on causes or solutions?
Put a 3-4-foot long straight edge on the keel and verify that the leading edge of the shoe is indeed above the keel line. Its a good place to start. If the edge is below the keel line then your boat will buck and hook when letting off the gas. Might be the condition you're describing. Another problem might be that your ride plate angle is too great and the boat is falling off the keel at high speeds. Verify the ride plate angle using an angle finder that is zero'd against the flat part of the shoe. If its more than 4 degrees it might be causing your handling issues especially if you are driving with a place diverter or other trim device in the up position. You might want to call Duane since he sold you the parts.