lots of good suggestions .
I dont think the blade is dull . I have only had this grinder a couple of seasons and it really hasnt ground that much meat . Probably 200 -300 lbs max. I have tried using both sides of the plate and it doesnt seem to matter .
I think freezing the fat partially makes sense as well as putting the grinding head in the freezer before starting , I have noticed the head sweating on the outside when I'm grinding. Maybe the temp difference between the head and the fat is causing it to stick . I DO grind the meat partially frozen but the fat is only at refrigerator temp. I add 2 lb beef suet and 1 lb bacon to every 10 lbs deer meat .
It makes GREAT burger . Non hunters dont even know they are eating deer