JC, I know you don't like doing things that you think have been done to death, but I think you should take another stab at tobacco. Excluding Ground Breaking, I can't find one I really like and I've tried all the top recommendations from tobacco flavor vaping enthusiasts.
I was, however, able to get a good result from blending together one that had too much caramel/hazelnut, another that had too much sweet vanilla with yet a third that was a blasé basic red & white (all with a month steep). I'll never be able to reproduce it though. I more or less haphazardly combined 3 partial leftover volumes of juices I really didn't care for and, surprisingly, it turned out much better than I ever expected it might.
Pure luck for me, but I think if you put your skill and knowledge to the task, you could come up with yet another something exceptional. Let's face it, there is a large tobacco lover demographic out there that is constantly on a quest for the holy grail of tobacco and tobacco-esque vapes.