Your experience mirrors mine and is common I believe. Totally sucks.....especially in a distance race with plenty of air.....when the halyard loosens, the jib luff bends off, and you can't sail to weather worth a darn.
I've been using a bowline on the becket as well and it has worked fine. Can't remember if I did, but you could always put a simple overhand knot in the bitter end to act as a stopper for it slipping out.
When cleating it off, I make sure to overlap the first couple of wraps with the next available ones, keeping it very tight the entire time (otherwise it can slip while you're still wrapping). After about six or seven wraps, friction takes over....a couple of figure eights and hitches and you're good.
_________________ Jerome Vaughan Hobie 16
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