I decided to go with spares instead of doing the BRITU. I brought home what I thought was 2 slabs of spares. When I opened the cryovac, I found three slabs. What's the best way to arrange these? I've trimmed them down and was considering cutting them in half to put in a rack, but I only have 1 rib rack. Can I roll them, or woulud they hit the lid? If I roll them, are there any special procedure (flipping and basting, foiling, etc...)