No experience with the pre 2005 model (when they moved the tank forward), but I believe the tank position is a valid concern. I have the newer model and wish the tank was further forward, but much depends on how you intend to used the boat, mainly how much weight you intend to carry and where in the boat its located. I am sure a non bracket model would a little better since the motor is on the transom an not 30 inches further aft. I find light to moderate loads no issues, but once things get towards max load, weight on the transom put the scuppers under water. Definitely sea trial WITH your intended load.
I think a bracketed model could be improved with a different bracket that has more flotation. The stock bracket on the late models only has about 250lbs of buoyancy fully submerged, not enough to even float the motor. I think 600-700 lbs is possible with the right bracket, not a trivial modification though.