Wow. Lotta guys gone through some chit with their boats I see.
Assuming not a cracked/warped head or more serious SNAFU, I would lean toward NilsC's diagnosis. Check age of intake,low pressure hose to be sure it's not collapsing when under higher RPMs. Swap the gauge too. I've had to do both before....sux, it's diagnosis by elimination in many a case. Just hope it doesn't take a whole season to be worry free when you leave the dock!
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