I do mine the same way, except I keep the smoker around 200-220. Keep them in foil for 2 hours and then BBQ sauce for the last hour. they are done when the meat pulls back about 1/4 inch and the rack will bend in half, without breaking.
I put mustard and dry rub on mine the day before.
I put mustard and dry rub on mine the day before.
I do the 3-2-1 method. Remove the membrane, coat in mustard, then add dry rub. I smoke the ribs 3 hours at 220*. Next, the ribs go in foil with apple juice and go back in the smoker and the temp goes up to 275* or so for 2 hours. For the last hour, the ribs go back on the smoker and are basted in sauce every 20 min or so.