what did you rub them with? the bark looks really black, almost like soot from either green wood or lump/charcoal that hadn't ashed. I am guessing your Traeger is a pellet smoker??? wondering if that's from the pellets??? I am not familiar with those on how the bark turns out.
I cooked them in a Kamado Joe I used the Kamado Joe lump charcoal and about four small chuncks of hickory. For the seasoning I used treager blackend saschatwean it is garlic and black pepper with some other stuff. The bark turned out amazing. It wasn’t too hard but had great flavor.