OK , try this. Remove your lead keel. Using rubber bands, one toward the front and one toward the rear on the outside of the hull attach small lead weights (like you by in a airplane hobby store). Add them slowly while flooding the ballast tanks. Add just enough to get your conning tower to submerge leaving about a half inch to 1 inch still sticking out of the water. Thats called submerged trim and thats whats most important. With it in this condition your dive planes will force it under. Now surface.Now whatever waterline she comes up to is what youll have to live with until you lighten the load or increase volume of ballast tanks or decrease pressure hull displacement. If it works to your satisfaction with the weights held on by the rubber bands then carefully record their position and quantity and then silicone them inside your hull in the same locations.
There are OLD pilots and there are BOLD pilots but there are very few OLD BOLD pilots. MAG