Did 4 breasts, each about 7 lbs in my 055. Brined them for 15 hours, then smoked @ 250 for 4 hours with 5 oz. of pecan & apple. Staggered them left and right on 4 different racks. Temps were 167 on the bottom to 162 on the top rack when done. I had wanted to take them out around 160, but they cooked a lot faster than I had planned. Next time I'm going with 225 degrees.
I am a little perplexed why they cooked so fast, as I had done the identical setup 3 weeks earlier with 6 lb breasts and @ 4 hours they were only registering 150+. On this batch I dropped the temp to 225 after 4 hours and cooked another 2 hours to get them to 160.
They were good, just not as good as the first batch.