I don't think there's a level max is there? Just an attack cap.
Only 2 S so far and they're Sayaka skill duplicates. Earning truckloads of tickets at duel rank A and loads of people idling with 1 member; but I swear the drop rates must have been nerfed because no way it's 70/27/2/1 or whatever it is. Also, trying out one of the A quests was a baad idea