Air magic was noticeably very powerful in Dom2, now I think they've made Air too hard to boost in Dom3.
It's really not fun to require A4 for *any* boost now, only some random high-end mages of Air nations can reach that (High seraphs or Vanadrott)..
And empowering for 100+ gems is only a SP game option
IMHO the simple Air Helm should be A3, and the (better) Bag could stay A4.