I'll add to this. This is one of the butts I did last weekend. I smoked at 275-285. I don't wrap when it hits 160, I wrap whenever it stalls and on this particular smoke I wrapped them all at 170ish. I also like to let them sit at the stall for a little bit and let the bark build up the. I throw in foil with butter, rub and brown sugar. When they hit 203 I pull them out and drain the juice for a finishing juice and throw the butts in the cooler. The bark on these were nice and firm even after being foiled. Good luck!