Brine along with rest is your best hope....
Last night grilled loin steak. Grill is Weber spirit 3 burner. Grill was at 400f.
Steak was tasty well done but wasn't juicy and tender. Removed it when internal meat was 165f ....
How to get a steak that is well cooked yet tender and juicy in a gas grill?
I do it by (lightly) sprinkling salt on all exterior surfaces, rub it to disperse, then wrap in plastic. Rest for a couple hours in the fridge. You don't have to get carried away with the salt to get amazing results.
I pull my steak at 130-140° (depends on the cut) and rest for ~5 minutes.
I pull wife's steak at 155-160° and rest the same. She doesn't like pink.