Im looking for a good set of FCS fins (thruster set up) for bigger surf that will hold well. The problem i am having is sliding out a bit on bigger days during a bottom turn. I have some great futures for the bigger stuff that hold great on deep bottom turns (the JC1 seems to work real well for me) , but of course all of my performance boards i have right now are FCS. im thinking something along the lines of one of these three: GMB-5, MF-1, or SA-2 all Performance Core. and I weigh between 185-190. Any feedback on any of these fins?