Against Bw(S) you can expect to lose a quarter of your front rank for every bound of shooting.
Hmm, maybe I've just been unlucky. On this basis, lining up 4 deep Reg Sp(I) and charging the Bw(S) ought to be viable, shouldn't lose more than 1/4 of the Sp(I) (one rank) and with the extra ME from the general and the baggage the Sp(I) would still be in the game.
Ah well, something to try out again, but perhaps at the club rather than elsewhere.