I never had very good luck with a jib furler on the 6.0. I was never happy with the way it furled. When it was realy radical and I wanted to furl it, I never could. I had a jib taylored with the hard battens removed and a series of kevlar strips sewn into the batten pockets. this works OK, the jib does not flog on the luff and it furls much better. This is not class legal but good for distance racing
Secondly, if you have a harken High Load small boat furler, it is not rated for the loads of a 20 foot beach catamaran. I know it is commonly used, but it is marginal. a couple of years ago I sheared the lower furling drum in 1/2 as a result of a pitchpole. It kind of sucked because we were upside down and demasted several miles off the coast. Several of the florida distance racers indicated that they had similar problems. I would admit that when I broke mine, I also broke the bowfoil and bent the mast in the pitchpole, so it was not your average load.

Eric