Despite the loss of my trusty Maverick (see thread), I made the best St. Louis ribs I have ever done. My first longish cook with lump (GFS) with a hickory/apple mix. Coldish / windy day today, but while it took over an hour to get up to temp, the WSM remained rock solid at 270 vent for the cook - total time 5 hours. I did not foil, spray, nothing at all. Used Kevin's rub which is fantastic, just what I wanted and put on a very thin layer of #5 sauce with some onions/serranos added. Very moist and tender - came clean off the bone with a small tug - perfect texture. My best ever and was done with very little effort.