I have an SC2 that is a few months old. I think I've worked out most of the issues I've been having, but now I'm trying to run a roll of 15" Siser Easy Weed through it and it is just bunching. I've positioned a roller on each end about 1/2" or 1" in. and a roller in the middle. Why would it keep bunching, and what can I do to stop it?