You nailed them!
Just some advice. I'm guessing since you moved your coal to the middle, you may have used the GBS sear grate (the hatch marks look like it too).
From experience and if you want nice grill marks, the GBS sear grate works much better if used with a front sear. I would imagine this is so because most of the browning process has occurred in the indirect pre-sear cooking.
Since I got my Slow n Sear, I rarely use the sear grate because a reverse sear with the SNS does such a good job with bumper to bumper browning.