Tom
One of the things I hated about my 94 H-26 were the 2 portable water tanks. I never figured out how to secure them well, they were the cause of most accidental water leaks, and a general pain. I switched them out for 2 Todd 6-gal. rigid polyethylene tanks, mounted horizontally under the galley, and vertically under the head sink. They worked well for years, then at a boat show I saw a new H-26 with the flexible tank in the bow. Out came the poly tanks and in came a 13 gallon flexible tank in the bow. I epoxied a bulkhead under the V-berth to keep the tank forward.The gist of this is that with a 9.9 Honda extra-long shaft in the back, the boat sits more level in the water than before I moved the tank. The pictures in the link below show the boat at the dock with 13 gals. in the water tank and 4 gals in the fuel tank.I realize every boat is different, but before I ruled out a tank in the forward area, I would take those flex tanks you have and put them in that area, plus a few more gallons, and see how the boat sits. It won't cost anything, and it may surprise you.The picture shows the waterline after a week at the dock as I was getting ready to wash it, and I thought it showed the boat pretty well level with no people on it.