After spending the past two weeks looking for specific pieces of graft armour from the superior shops it has suddenly dawned on me - it would appear that hardly any pieces are actually spawning in shops.
I'm sure somebody will correct me if I'm wrong.
Only Graft helmets & pants are spawning in shops.
I'm not seeing graft Chest, Sleeves, Gloves or boots in any superior shops - and I've checked a lot of them!