Having a party with 2 AST requires more communication than any other healer combo. Especially as mentioned with cards, I personally type out when an enhanced or extended card is out in hopes the other AST sees it and not override with an expanded card. My only beef is with sects, everyone loves diurnal in DF, yet I've seen occasions where no regens are going out and that AST is only using it for the SS increase in cleric. Meanwhile I'm in Noct. having to use a bit more mp healing, not a detriment, just annoying.