Wether or not you can use fast flight on your recurve depends on if it was built for it or not. I have one recurve that is built for fast flight and one that is not. I also have two longbows that are built to handle fast flight but I still shoot dacron on them as I didn't notice an increase in performance with ff. I don't build my own strings but from what I've seen if you build the loops up some it should be ok.
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