I've been having the same problem. We no longer even try to cook them on the grill and my DH is a good griller! I asked the butcher about this and he thought we were grilling them too long. I don't think so. The only way I fix them now is to flour and brown them and then add a little water to the pan, cover and simmer for 30 minutes or so. Also try try to find the chops with a little bone, called rib chops around here. But, I think they have gone so far trying to reduce the amount of fat in pork that it has made them tough. JMHO