8100 RPM

Bet that swelling took a while to go down....

Hey Tommy, if I send you a loader for the Sanger would you try it? I think the pump is over loading, two questions though.
1. Does the porpoise go away if you nail the gas?
2. Does the porpoise come in quick, or slowly and predictably?
If it comes in slowly and predictably, the extended pump fins could be creating a "low pressure" area under the rear of the boat causing the boat to "teeter totter" on the center point of the hull, it will not go away unless you stand on it, pulling the boat back down in the water giving it something to climb, or faking a hook with some ride plate adjustment, which I hate doing.
I think the engine being forward accentuates this horribly. The loader I want you to try is a plate type and was run on a River runner and cured this exact symptom. You might even have one in those rafters of yours, it needs to be a plate type loader and not very aggressive, this will "bypass" a lot of water at speed and keep the pressure stable under the bottom of the intake, it may take away a little of the out of hole performance (can you say inducer?), but would be worth it in the long run I think.
let me know if you want to give it a whirl (no puhn intended).
Don't be afraid to tell me I'm full of crap though too, its been a while.
Once loaded this thing would work great, it will probably turn hard enough to scare you.

GT