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Hello, my 2010 Tahoe Q5i is only making it to 3500-3700 rpm and tops out about 32mph WOT and trimmed with just me in the boat (215lb). 4.3l carburated 190hp with stock 14x23 three blade prop. Tried a new 14x23 four blade (should be a 14x21) but results roughly the same. Prop hub is good (no...