I can't remember, at what point and why did we narrow it down to just those four hops? At the beginning, I recall people saying that there was a six-hop blend or something, but some of that might be extract, et cetera. Do we know for sure there isn't maybe one other hop in there?
My friend brewed a rather nice Columbus single hop IPA a few months ago. It was shockingly fruity, reasonably dank, and not very earthy. Not really the usual citrus fruitiness, just a general, soft fruitiness. Took me totally by surprise. So what about something like Apollo in Heady Topper, in small doses? Apollo seems to have an even more intense "dankness" than CTZ.