I have never felt the engine hit the rev limiter. The boat would go 44 mph with the stock 3 blade @5900 rpm. With a four blade, it goes about 39.5 @ about the same rpm.
I don't go fast anyway. Where I ride there is rarely enough flat water to go wide open with people in the boat. The four blade is the way to go for wakeboarding. It makes the boat much easier to drive at wakeboarding (21mph) speeds. I run a 13x13 OJ 4 bl 1" lh with heavy cup.