I have a 1996 corwnline 202br with a 5.7L/thunderbolt. The out drive is a merc alpha 1 gen2 with a 1.65 Gear ratio. I have two props, one 21p aluminum and a ss High Five 21p. Yesterday the aluminum was doing 49mph@4600rpms. This is supposed to be the high end of my WOT range(420-4600). I...