In a small bowl, mix oregano, 1-1/2 tsp lemon zest and 2 Tbsp fresh lemon juice, oil, garlic, salt, and red pepper flakes well with a fork. Spread over both sides of pork.

Prepare grill for direct and indirect cooking over high heat (500ºF). Preheat grill, then turn one burner off (or, for a charcoal grill, leave outer edge of the grate free of coals). Lightly oil grill grates.

Grill chops, with lid closed, until well-seared with grill marks, turning once, about 2 minutes per side. Move to cooler part of the grill. Grill until internal temperature reads 145ºF on an instant-read thermometer, 15 to 18 minutes more. Remove chops from grill and let stand for 3 to 5 minutes. (The temperature will rise about 5ºF during this time.)