Was there more or more graphic drug use in the unrated version? I thought the only differences were a few more shots of skin at Big Tim’s sex/drug party, the ‘prep’ part of Sara Goldfarb’s TV show hallucination, and a second, longer gawk at the top of Jennifer Connelly’s who-ha? 
I really wouldn’t know about the R-rated version vs. the unrated version. I saw the unrated version. I don’t know what they cut out of the R rated version.
In the version I saw, I don’t think they’d show that on Skinemax or anywhere else. There was a lot of everything showing. I’d bet if I’d seen that on a censored channel, it would have been less… well, just less of everything.
You saw a heavily-edited version of RfaD with commercial interruptions and weren’t impressed by what you saw? Perhaps viewing the original, unedited film would show you more of what you are looking for…