So, here's the scoop on my ACME. With the OJ 13X13 4-blade I had on my SX I had a great hole shot and got 32-33 mph at 6000 rpm at WOT. Called the ACME guys and got their recommendation. ACME 13X12 5/8 3-blade. Put it on and went for a ride. Had my normal crew and the ballast full about 1500 pounds. I'm no pro, but I couldn't tell a difference in the hole shot. At WOT, I was at 37-38 mph at 5900 rpm. It seemed like the same initial acceleration, but much more responsive to throttle movement on plane. When boarding at about 22 mph the rpms have dropped from about 4100 to 3500. It should give better mileage just because of the decrease in rpm. Also, less vibration and noise. I like the prop. My wife who knows nothing about props etc. said, "why is it driving so much better." THe only drawback that I can see is that it is a little harder to hold speed because the throttle is more sensitive at wakeboard speed.
Next, pp. I'm going to get it installed by Marine Products while I'm on vacation next week. Gotta go, the lake is calling.
