Sorry? "Loses very quickly"? And you know that by just looking at the position without any concrete analysis? Lyudmil, Lyudmil.....the line you suggest, 11...b6, quite probably loses very quickly after cb6:
11... b6 is a very normal move in this position, so at least you should have considered it instead of focusing on 11... e5 only.
After 12.cxb6 black doesn't have a backward pawn on c6, as you cannot prevent c6-c5.
Anyway, it is not necessary to explore 11... b6 even further (I think white can get an edge there), as your whole line starting with 11... e5 including 15... Bg4 16.f3 exf3 17.gxf3 Bh3 simply seems to be very good for black, contrary to what you claim. A sample line: 18.Qe2 Nh5!? and black is ready for plans like Nf8-e6-g5, or Ng6 and f5, doubling rooks on the e-file and start squeezing your feeble centre. In the meantime your minority attack is going nowhere and Bc3 is a sorry spectator.