I don't seem to get a good bark smoking ribs on my Traeger...Not sure why. I apply a rub and put in the smoker...But I don't seem to get a bark on the ribs. I put on two racks of ribs around 12 pm. They are getting close to being done...Just don't seem to have a good looking bark on them. Am I doing something wrong? using apple pellets for this smoke. Any advice greatly appreciated. I just mopped them with some Sweet Baby Ray's BBQ sauce.