1.If using grass-finished lamb, use less masala as it will have less fat and so won't let out much water. The recipe given is for grass-fed lamb which will let out water and so some masalas will be oozed out in the water let out by lamb. Also, as grass-finished lamb will have less fat, I recommend using olive oil. Mix oil just before baking. Do not mix oil while marinating as oil won't let the masala penetrate through the ribs.
2.You shall skip overnight marination and bake it immediately and it still will taste good but overnight marinated ones will taste tooo good ;)
3.Make sure there is no water in the tray before turning on Broil mode as water might cause smoke while broiling.