I had my Kettle with a floor and dome temp in the 800-850 range using the Kettle Pizza new flat dome from Baking Steel (they actually have a modified design since I bought the first) and the ProGrate.
Lonestar 24" Vertical offset w/ Insulated Firebox & Performer Platinum
Former owner: Jambo Backyard, Klose BYC, Med. Spicewine, Pitts & Spitts, XL & (2) Med. BGE's, 22" WSM & (2) 18" WSM's, 18" & 22" Weber Kettles