Pork Chops are one of my favorite meats to grill. (just polished-off one left over from last night for Lunch):
Not sure how thick yours were, but I like thick chops for grilling - around an inch to 1 and a quarter.
Sometimes I marinade, sometimes I just salt & pepper them and toss 'em on (Last night, did a ginger & sesame "teriyaki-ish" marinade.)
Generally, I grill them indirect for roughly 15 to 20 minutes over medium heat. Give them a little smoke wood of your choice here. At the end of this, most of the fat around the edges has rendered away to a thin strip.
Then, for the last 3 to 5 minutes, I crank-up the heat, brush them with a little sauce (bbq or equal parts honey & Inglehoffer hot mustard are some of my favorites):
-Direct to semi-direct heat for this phase
-Sauce lightly
-Let it carmelize a bit
-flip & sauce other side
-Carmelize a bit
-Take 'em off and let them rest for about 2-3 minutes
-ENJOY
Hope this helps you improve your results