If BARCH is working well for you in that range, stick with it! Don't lower if you're managing good loot. I was referring to the giant/wizard/whatever else army you were using. BARCH should be good in that range :)
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I had 4 wbs, 4 giants with barbs, archers and gobs. Exact amounts depends upon camp space.
I'm TH6 now with 150 camp space using c.32barbs, 41 archers and 49 gobs (plus the wbs/giants) and had no problem at all. Allows you to easily get the collector raids, and get some of the protected storages. I love gobs at this level. Bases have a high proportion of "resource buildings" and those guys chew through them so quickly.
Its great being able to do 4 walls from 1 raid. I'd love that on my Th10 main.