I'd prefer a smart system where;
Medium armor sets;
Common drops - Robust
Occasional drops - healthy
Rarely drops - arcane
Heavy sets;
Occasional - Healthy
Occasional - Robust
Occasional - Arcane
Light;
Common - Arcane
Occasional - Healthy
Robust - Rare
It's really not that hard. When you try to play Grindibg games with giving people 20 Arcane Briarheart drops to one robust or 20 robust willpower to one arcane to jack with replay ability is when people get upset.