For CS55, place wood as close to the front (side toward door) of the wood box as possible and make sure it stays there when loaded.
Much better burn with majority, if not all, wood reduced to white ash.
Credit to Floridave for this tip.
If you have an extra rack, cover the bottom (grates on top) with foil and place on bottom of cooker then poke hole for drip drain. Much easier to get foil in just right. Just throw the rack in the dishwasher with your others.