I tried a little foiling experiment. I usually buy spares from Costco that are 8.5 lbs for the 2 of them. I rubbed them right before putting them on the WSM. Usually my ribs take about 7-10 hours. I did a 5-.35- 1 cook. 5 hours in the smoker, 35 foiled and 1 hour in the smoker. It never ceases to amaze me how little time you need to foil to get the ribs more tender. I think they are just about right. Tender but not mushy. I could probably have even gone only 25-30 minutes but they are still pretty good. I then put sauce on them and finished in the broil to crisp them up a little but not burn the sauce. Not traditional at all but I was in an experimental mood.