Bob
when I smoke a pork butt i wrap at 165 it. I have found that wrapping speeds up the cooking process and powers thru the stall. When I wrap I only put the butt in a foil tray and cover with foil. I add no liquid. I then cook until 203-203 it. Once, the butt hits the desired temp, i let the butt rest for an hour or two in a cooler wrapped in towel.
my $.02.