I just had an idea to at least band-aid the issue of first tick of combat degrading the custom fit trimmed masterwork armor. We are aware that to fix the issue properly might mean a whole revamp of how combat works in the back end. But in the meantime i wonder if this idea is possible:
Give the armor an effect that allows it to heal 1 tick of repair if you kill a slayer monster (or boss task monster) with the armor equipped.
This would counter the current 1 tick of degrade that happens in a really jan*y way until you can fix the back end system issues.Fire ice341