Pellets getting stuck in auger

[pleetch]

I have a St. Croix Auburn corn/ multifuel stove. I've been running straight pellets in it for 4 years now and have had no problems. But this year, there was a shortage on the pellets I usually buy, so I bought some others (cheaper with more dust). Since then, I've had nothing but trouble. Most notably, pellets keep getting stuck right where the auger and the metal auger cover meet. I replaced the auger motor thinking it was weak. Checked the vacuum switch, it seems to work. Cleaned the hopper and auger as best as I can figure out how. I'm wondering if the auger didn't get moved a slight bit or there's something else I need to check. I don't know how to adjust the auger either..