Your right A.O. Razor.
I always thought the revolutions where x7 for some reason.
Regardless you really need to try everything you can get your hands on. Every boat and setup is different. When i set my race boat up i was told by the best in the business that i would need a ET Lightning. Ended up being the slowest and worst accelerating prop yet!
The fury works great for me..... it may or may not for you as with any other prop choices suggested.