This is becoming interesting..Something has to be causing the problem..Is it just the one bag of pellets causing the problem or have you tried a second bag of Smoke Ring pellets?
If the auger or auger motor was the problem I would be led to believe the jamming issue would be with all pellets unless the auger/motor problem is marginal that would not be caused by smaller diameter
and/or shorter pellets.
In my troubleshooting days, I always said, the answer is always simple. You just have to find it. A Tip: Don't overlook the obvious. Good luck!