Thanks for the considered replies folks I've been using MFC's in my Kombat and Isonic and really love them compare to the standard fins.
I also tried a mates evo that had an mfc in it but i didnt know what it was (neither does he) hence the question.
So far i only had the drake fins in a 22 and 23, the 22 was good on the e-70 in a gale but pretty sticky otherwise, and i never really clicked with the 23. But i now can get a loan of a drake 24 so i will try it out on the 70 next time it's 5.2 wind.
I'm just trying to solve that age old dilemma of relly great acceleration & jumping but also with super loose turning, time to get the $$$$$$$$$ out i guess.