@danielplainview: Yes, I put a piece of 320 grit paper on the end of a Castelford reamer bit. I think this method is potentially less damaging to the bowl vs trying to use the reamer on the final stage.
I was finally able to smoke the pipe for the first time tonight. My cleaning efforts paid off, no foul tastes. What a great draw and button. I love the stem/buttons on this pre-Transition Sasieni's, perfect for my taste.