Advantages of ff strings?

[Red Beastmaster]

When I got my new custom hybrid longbow I put a B-50 string on it because of supposed shortened bow life with FF. After a few years of shooting it really well I broke down and tried the FF string.

Wow, really noticable increase in arrow speed! Also a really noticable drop in accuracy which I contributed to the flatter trajectory. No big deal, just something that I'll get used to and my shooting should come around eventually.

Well, it's been a year and I'm still all over the place with it. It's like I lost the feel of the bow. I never got used to the "doink" sound yet either. The FF string is in the garbage and my old B-50 is back on it.