I ended up buying a halyard from Mike Krantz which is half soft stuff and half dyneema. The skinny dyneema starts just above my mast mounted halyard clete. I've had no problems since, but I'm still running the two line set up.

Now, here's a question, how do you tail off your downhaul lines so that you can reach them and adjust it while staying out on the wire? Right now I've got mine tied to the mast rotator, so I can grab both at once, but I have to come in to reach it. Is there a way to keep it handy while out on the wire?