How are you getting the rpm reading? If it's through a dial type guage then it could possibly be off. However, I have basically the same boat with the same motor and prop and am 38-39 mph with 2 people aboard at 5600 rpms and the motor in the lowest setting. Raising it could gain some speed but...
Each pontoon should have 2 or more chambers. So, in your case the back portion would take on water but the front would not. Unless it is damaged as well. You could lower it on the lift to see how bad it will get just sitting with the lift under but not supporting the boat. If it sinks too much...
We have a boathouse with pilings driven into the lake bed and our water stays relatively constant year round. We have a 6,000 lb lift that is attached to the boathouse structure. It has thicker beams where the cables attach to support the boat. The 6,000 lb lift has always seemed adequate.
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