We have relatives coming over this weekend and I know one of them are bringing a couple marinated racks of ribs (assuming St. Louis). I will probably only have 4 hours at the most to smoke them on the MB 800 gravity. What temp/time should I do this at? I will probably wrap in the middle with the marinating liquid in the foil. I was thinking at least 285 for maybe 1 hour, bump to 325 during wrap for 1.5 then unwrapped till done.