The undercrown is one of my drunk smokes, it's an awesome stick that does the same thing every time for me, mainly, I can smoke the heck out of it and not worry about burning a hole in my wallet or missing out on a small nuance, I've never had a burnt ashtray taste come out of one, but I have had some real bad burn and tunneling because of how fast I was smoking. It could be a combination of being too dry when you got it and swelling with you "correct" humidity, and smoking too fast. I'm a little OCD about certain sticks, and take the time to let them acclimate to my humidor before smoking them.