Brett, you always seem to get the racks to that state of excellence of medium rareness! What sort of timing are you doing? Quick sear then indirect is what it looks like temp to what? I don’t do them often enough anymore to have the “eye” for getting it right, I need more practice again but, yours are so pretty!
It’s a little easier than you think.
Dry rub and let the rack rest for 20-30 minutes.
Place on hot grill indirect location for 10-15 minutes. This is the main cook.
Your temp will get to 105° or so from that 15 mins. Make the 100-105° your target.
Next comes the dance. You cannot leave lamb in direct heat over coals. Too much fat will drip and you’ll be in inferno mode.
You have to flip, move and rotate the lamb rack. Sometimes I have to pull it off completely and close the lid to extinguish the fat fire. It basically always happens.
So starting with a clean grill is important so you reduce the risk of grease fires.
You also have to cook the frenched bones too. But you cannot leaves the bones over direct heat for too long as they’ll singe off.
So you’re dancing the lamb around the grate and then probing with an instant read thermometer in the thickest part of the rack.
I like to goto 125° and then rest the lamb in a tray tented so the temp rises a little and the juices settle. I prefer a 10-15 minute rest.
In the prep portion of the rack, I highly recommend you score the fat cap. That helps the seasonings penetrate and for the fat to render and crisp up some. You have to cook the fat on rack of lamb. It adds massive flavor to the finished rack.