I have a 3 pt Befco core aerator and it is not pulling or removing plugs like it should. It will "punch" holes in the ground...but isn't removing the soil and putting it on top of the ground. It seems like the spoons get "full" and are not "cleaning out". I clean them out each time before I start with a hammer and punch. I called Befco and I am doing everything exactly as they have suggested. Entry is at the correct angle and tines are in great shape. Have any of you ever had this happen? Any ideas on what to do?