Georgie, im partial to the trex method for pork chops, sear it, rest it, roast it. basically what your doing is searing the outside first for looks and taste, then resting them on a plate til the egg drops down in temps to the high 300's, then back in to cook the middle. depending on thickness they come off the grill in the 130's and hopefully rise in temp to about 142 internal on the counter, anyways thats what i shoot for but it usually goes a little higher. thermapen is your friend. you can cook them at 500, timing is more critical, and its ok to change your plans during the cook if you see something not working as planned. something ive never done with pork chops is the water bag method, put them in a ziplock in hot water for a half hour to get the internals up, then onto a hot grill, bet it would work well at 500 dome