Jet, I don't know the exact science behind it, but I believe its due to friction on the water due to the 3 stage shape that slows it down, a continuous rocker is a faster board, less friction so it would release faster for air tricks... As Chris stated earlier, the 3 stage is not really required at cable, its different than being behind the boat... I think I read that the 2012 fast track has more grooves to hold better, and some said they use a lock nut on it and no problems, I think you are good to go.
I ride the 09 response at hydrous (and behind the boat) and I love it. If you really want the non fast track mounts, Ill sell it to you if you want