Only with the sloppiest of snow have I had any clogging. With my old, slightly underpowered maching I would could have some clogging, if I overloaded it and it bogged a bit, it clogged once or twice. I have not had a probelm with my new machine. Is there something in the pathway? You need to clean the chute out completely after each use.
I have never had a reason to coat the inside of the blower with something, nor would I ever consider doing that. In my opinion that would probably make the clogging problem worse with something to freeze, or have something for the snow stick to. I have never heard that recommendation until I started reading this forum, nor have I ever known anyone to do that up here. The cold, smooth steel provides very little friction.
For you guys up east, here in the central UP of Michigan it has snowed continuously since 12/31. I had to blow 12" on 1/1 about 12" on 1/3 and at least 12" today (1/4) and it expected to snow contiuously all week. It is part of that puny storm you are having. As the outer bands of your cyclonic low pressure swing south across Lake Superior, it snows here.