if your mincer is struggling your blades maybe blunt and need sharpening, there are companys that cann do this. Also if it struggles with connective tissue and sinue try a coarser mincer plate.
Also may sound silly but the mincer i used to use at work if you hadnt tightened the assembly up properly (the worm, blade and mincer plate etc...) it would clog and come through as mush.
Hope this helps