Ive got an event at work coming up where we will be cooking 5 prime rib loins on pellet grills. easy to cook, yesterday I cooked one for practice, pulled it at 126 and put straight into a cooler, over the next 2 1/2 hours the temp slowly climbed to a maximum of 149. so that didn't work, how can I cook prime rib and hold for a couple hours with out that happening.. PS after 5 hours in the cooler is was still 138, thanks for the advice