Are you heeling so much that the raw water intake comes out of the water? I certainly hope not!
I would guess that either the impeller is worn or the pump is worn. As they get worn, the pump loses the ability to generate a lot of suction. I would first change the impeller to a new one and if that doesn't work I would change the pump.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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