Hello all! I am running a Gheenoe LT25 with a Evinrude ETEC 25HP tiller on the electric jackplate in this post: viewtopic.php?f=5&t=22891&p=177874#p177874 I have a three-bladed aluminum prop which is the standard 10" diameter X 12" pitch I believe. The prop starts to slip when I've raised the motor only about 2 inches. I would like to be able to run with the motor all the way up (another two inches of lift). Would a four-bladed 10" X 13" prop help with this (+/- cupping)? One problem is that I don't have a tachometer, so I don't know what my RPMs are with different props. Thanks for your expert opinions.