Sound like your getting too much slip. send me your max rpm, pitch , gear box ratio, has the prop still got cuppingon it and boat speed ( gps ) not Mickey mouse speedo. and ill tell you how much slip you have from your prop. Do you have any speedo pick up in water from back of hull which could be making a disturbance in the water I.E. bubble's which are making you prop ventelate. !!!!
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