I'm going to focus on spare ribs for the next couple of smokes, and I want to max out capacity on the 18.5". From what I gather (and the 3-2-1 recipe on this site), I can fit 3 slabs per grate by snaking the slabs on the rack. The thing I can't figure out is, when it comes time to foil the slabs, do I just stack the foiled slabs on top of eachother (assuming they'll shrink and will fit), and then put back into the rack for the last portion of the smoke? Or do I just skip the foiling if I want to max out capacity and keep the ribs in the racks? Searched a bunch with no luck on this one, any help would be greatly appreciated, got a party to prepare for!! 
