Running 4507 rpm wot loaded with two people and gear in my 15'4" highsider gheenoe. 2001 15 HP Yamaha two stroke. Currently has a 8-1/4 diam x 10-1/2 pitch. I am thinking bout keeping that prop and using it while I am running light and solo. Looking to get another prop for when I run two people and gear. What should I get? Running about 19.5 mph loaded w/ 2 people and gear at 4507 rpm. Can I get more speed and improve hole shot or is it one or the other?