Mark...
filling the stern tank may slightly balance the cross ship list but just mostly sit the stern down more. Figuring 8 pounds a gallon, thats an additional 240+ pounds back there.
I looked at my boat the other day from the finger pier the next one over from my slip (slips still empty between). The port side water line along the boat was even along the waterline stipe from bow to stern and the bottom paint more exposed than the starboard side. Looked at from the starboard side and the stripe is noticeably closer to the water, but even bow to stern.
The port side water tank (and stern tank) is empty as is the holding tank and water heater. Only battery weight is in place now. Tool box is under the port side salon seat now. Once the port side water tank is filled, and the water heater filled, the boat floats much closer to even balance side to side.
Cruising on the Bay, we're not anchoring out over night so are able to refill the port water tank wherever we tie up if need be. We've had no need for the capacity of the stern tank.