I have a '18 Nitro Z-18 and was wondering what a different pitch prop may do for me. Boat set up includes 2 power poles, 4 - 29 batteries with a 6" hydraulic jack plate. I have a Mercury 150 Pro XS with a 21p Tempest 3 blade on it. Prop to Pad is 3 1/2" with 15 PSI water pressure (analog gauge)WOT. I can run 56+MPH (GPS) with the tac @ 6000 RPM (analog gauge). If I trim it up any higher I lose water pressure severely, and any lower I lose speed. Hole shot is GREAT. Can I get any more speed at WOT without sacrificing too much hole shot?