I just use barch (92 barbs 92 archs 8 wbs) and 3 healing spells. I only go for the 1500+ DE raids, and usually I only have to drop 1 spell per raid, if even that.
I did this exact thing for months, and recently added 24 gobs, with 80 barch. I've found the gobs are great to have on hand for rushing the vault, and can often clear it out fast enough that you don't need to use a heal spell.