With a Yammie F100 plus a kicker, probably similar transom weight, I run a touch slower with the Solas Amita 4 blade in 13x15 in aluminum. Plus a hydroshield. 33MPH. Same revs. Sometimes I can plane down to 12, mostly 14. I would try the 4 blade, and then a hydroshield if you want that low planing speed.
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