"Went up to run a new halyard and noticed the forestay wire was starting to fray. The rigger at the yard said I probably furled too-tight and wound the extrusion around the forestay. "
Could partly be from having a 18-year-old forestay, they DO wear. And if the
rigging tension has been too tight for a long time, that will make strands pop faster. You should get a Loos tension guage so you can check your
rigging from time to time. And while you've got that rigger in the yard, ask him to show you hands-on how much tension is enough for the
furler. Generally, all you want to do is roll up the sail--not fight it when you are winding it.
Might pay to check the other stays while you are at it. If you run a cloth (skin hurts) up and down the stays and "meathooks" tear at it, that means the wire is breaking down and should be replaced.