I think I just had a mini epiphany - Last night I decided to crack open a Saison (Wyeast 3711) that I had brewed last July to see how it was aging. I was greeted (as expected from memory) with the same flavour/aroma that I have been experiencing with this stout...fast forward to this evening, I popped a bottle of La Trappe tripel half an hour ago, and wham!! - the same aroma/flavour. So after a brief browse online, I think what I'm experiencing are Phenols. Does this sound more like it? btw, the aroma in the primary seems to be far less than it was, and is now beginning to smell more fruity. I have not tasted another sample though, so I can't speak for that just yet.