Karl,
I have 4 Harken Carbo autoratchets on the Javelin and it works well most of the time, occaisionally hanging up in light air, which might be fixable by adjusting the cut-in tension on the front beam blks. I'm lazy enough to not having got around to messing with 'em. I also have an additional lightly used pair of them off Flight Risk you could have reasonably if that's the route you finally choose.

Dave
509 276 6355 or PM me.