Have a 193 w/ 200 hp OX66 Yamaha on an 8 inch backplate. I don't have a prop to pad measurement because I run a hydraulic jack. I just got all of my gauges working so I know what she is dong now. I am running a Tempest 25. With the jack all the way down I am running 63mph at 5400 rpm. If I start raising the jack, I get my rpm's to where I want them (about 5800), but I slip so badly that I lose nearly 10 mph. Any suggestions?