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My 94 gulfstream has twins yamaha 150 saltwater series 2 stroke.Only getting 4800rpm at wot.Acceptable range is 45-5500,so I am at low end of that.I have Michigan Rapture 14.25 x 17 stainless props.Was told these have extreme cupping and they usually pull more rpms than a regular SS prop of same size.I would like to see what other grady owners with twins have for prop size to make sure I am in ball park.I just bought the boat this spring and really love it,great boat.Would like to get her close to midrange to upper range of recomended wot....thanks