I wonder if you got a lemon, Avenging Angel. The Dragon's my first GBB, so I don't exactly have much previous experience to drawn upon, but I'd say my slide's pretty crisp on just propane.
Apparently the Dragon uses a lighter metal for its slide, or so the theory goes. I don't have a regular WE Hi-Capa for comparison, but I think all the non-split slides can take CO2 without the same problem as the Dragon, even the Baby. Don't quote me on it, though. That the Dragon can't take CO2 has been confirmed by the manufacturer, read supersized's link. I should know, I'm the one who asked Randy to ask WE.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."