I have a similar stock list as the fish in your tank. I have black skirts, cories, balloon rams, a green severum, and some brilliant rasboras. They all seem to be getting along in my 90 gallon tank but I also wanted to add more severums. I was thinking one red, one gold, one green, and a red shoulder. Is four severums in a 90 gallon too much? Sorry not trying to steal the thread but after hearing your story im cautious to add more. Previously stated was that you add tiger barbs as a dither fish but I suggest you dont because they will nip at the fins of your gold balloon ram.
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