Quoting/copied from user manual "GROSS PERMISSABLE WEIGHT IN WATER.................................1305 LBS
(INCLUDES PASSENGERS, CARGO, ACCESSORIES AND OPTIONS)". Your "like it sits" weight only leaves 185# for driver&passengers/fishing gear/etc....yet you said both you and a passenger were in your MAX in the water. With the center of gravity being changed by the heavy roll cage, I can imagine the MAX was a bit unsteady in the water.