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I put mine in this morning at 10:00am and it's almost to 160* Five hours. I also spatchcocked it and man...it looks good. It's on at 250*. I am also not caring one way or the other about the crispy skin since I am going to slice it all up and reheat for tomorrow.
Your MES tops out at 275° so use that un till the breast gets to 155° then move it to an oven at 350°-450° till IT of 165° and you will have crispy skin.