First time out of the barn with four racks of spare ribs. 3-2-1 method and they came out great! Used my turkey roasting rack upside down which held all the ribs. Friends said I should go into the rib business. (Don't think so myself but they were good!) No diffuser and got just the right amount of char on the underside. Got a little hot in the middle of the first cook (3) up to about 240. Messed with the valve for the rest of the time but managed to keep it in the 220-230 range.
Blue? No, its more of a purplish-mauve...