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Generally, I would be surprised to see that much pitch on this boat. What is your speed at 6K? Are your throttle cables properly adjusted?
How is your trim? When you say 'over rev' do you mean at a constant speed or are you ventilating (often confused with cavitation)? If the motor rpm is 'jumping' up to the 6K limit then this is likely not a prop issue. Your prop may be out of the water.
From a standing stop, you normally would have the motor trimmed all the way down. Then as the boat gets onto plane and speeds up - trim the motor out to increase speed and to keep the bow from plowing. By trimming the motor out too much then you will ventilate - or if trimmed too far out when first getting on the throttle.
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