I am looking a getting a new AL prop and not sure which one to get, i have read some good things about the Michigan match and the omc al props. I now have a 13x19 sst on my 1720 key west cc and its way to much prop, only turning 4600 wot. I am looking to get 15 pitch prop to help with rpms. But with the weight diff of the props from ss to al would that alone be enough to pic up a few r's? Motor is a 94 88 spl.