I had the same problem on my boat. I swapped to Harken gear and that didn’t help the fraying problem. I was replacing the wire genoa halyard every few months.
Then someone spotted that the halyard looked ever so slightly too wide for the sheave. Sure enough, on measurement it was slightly too big. As I had been asking for “like for like” replacement each time, the problem didn’t ever go away. Getting the correct diameter wire sorted the problem (and I use a Helyar flexible spar for reefing as well as furling).
Mind you – I can’t remember what the correct diameter for the wire actually is but I’m sure someone will know.