I feed 50/50 mix of corn and protein (mainly Angelo Pellets) year round out of 8 feeders now. Been doing this for years, with minimal problems.
I have found that if you use regular spinners ( I used to use the stainless rectangular ones with flaps on the ends), you'll have a higher chance of blockage at the spinner over time.
I started using Eliminators (round) due to my coon problem. I have found that my blockage problems have become minimal to nonexistent. If I had to guess, I think its because the Eliminator sits flush with the bottom spout on my barrels, whereas, the normal spinners had a gap where the corn/protein is exposed from the spout.
Hope this helps.