S2 15-8 is not worthwhile farming outside of AR, when WE flag cost is reduced and loot is increased. As everyone has said before, and more importantly Barryz does too, 8:7 is still ok for recruits.
I used to have lots of recruits but once maxed my 4s* and due my lacking of compasses i started to level up all what i have minus the 5*. Adding i usually have exess of hamm i burn recruits very fast using tc 1 2 and 3 and the rest 11