3.0 I/O and a Alpha one outdrive pour performance under load

by John
(Clay; NY USA)

I have a 25' Pontoon Boat with a 3.0 I/O and a Alpha one outdrive

When running at 1800 RPM's unit runs fine boat goes about 11 mph but under load at 2300 RPM's feels like it just spins and does wait to go faster.
Any input is appreciated.

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