Hey guys. Ihave a 1990 ranger 374v with a 1990 mercury 175 and a 6" manual jackplate. I am currently running a laser 2 25p prop. I can the motor 6000 rpms but can only achieve app. 54 mph gps at wot. I have moved the motor up and down and tried both, it is currently 3.25 below the pad, I tried...