I made some venison summer sausage and was going to grind it 2 times. the first time I ground it through the 3/16 plate mixed the spices in and then attempted to grind it though the 1/8 plate. I read where you were suppose to let the grinder pull the mixture through but the mixture would not go through without really pushing it down the tube. Am I doing something wrong? I really had to exert a lot of pressure to get it to grind.