Everything I have read says time and temperature for a pork butt (and brisket) is 1.5 hours per pound at 225º. I have yet to get 1.5 hours per pound at 225º. In fact, I can't get 1.5 hours at 250º. So whats the deal? Any one else have this issue? I use a Landmann 38" gas smoker and a Maverick ET-732 thermometer. Thanks.