I got my 640 last week and so far I love it. I did the initial bacon cook to season it up a bit (with some ABTs for good measure). I have also done baby backs and a pizza so far. Everything has been awesome, I am really pleased with it overall.
I know you have to learn your own pit and all but I am wondering where everyone else has sets their damper to get the most even heat across the entire lower rack? On the bacon cook the row on the right side got a bit overdone all the way up to 6-8 inches from the side. For that cook I had the damper pushed in about 5-6 inches since that seemed to be a common position people used here on the boards.
During my rib cook I tried the damper out all the way and my maverick read about 40 degrees hotter than the thermostat when it was in that far right position. I moved it to the left side at one point and it was within a degree or two of the thermostat.
I emailed with Byron from Yoder and I am going to try pushing it in even further to try to even the pit out a little but I thought I would ask and see how you guys run your 640s as well.