Tonight for whatever reason while doing just that I thought, my imp as destro hit a lot harder than my succy does, why not drop my succy glyph for imp. firebolt glyph, move 2 points from bane into dark arts and give it a whirl with my imp instead. Might net me a few more dps, might not. In my gear which isn't the best I usally do around 8500 dps consistantly while alone on the dummy with a succubus. I was very surprised to find with my imp I was doing 9000 or more dps consistantly. I tested 5 times at 5 minute intervals to rule out rng, and sure enough it was a 500-600 dps increase every time when using an imp.
So I'd like to see a few more solid aff. locks give this a try and see if they are getting the same results as I did and post their feedback. Any dps gain we can eek out helps right?