HaHa!! To be frank whenever you see choppiness like this at the top its timing being pulled and put back in, doesn't look like a finished product. I was wondering if it could be slippage from the drive wheels on the rollers.Maybe they had a Sport with the square wheel option.
I could be wrong, but I'm wondering if it's a safe tune and its running rich. The peaks is adding timing and then dropping back off. At least I hope that's the cause since it means the sport has more power left in her.
As I recall my SHO's dyno looked similar at LMS.While you were waiting for your date, I went and posted in their mycalibrator thread on 2gf asking about the rough dyno chart. They promptly responded back with the below answer:
"It's the computer keeping boost and power output at a target value. It's exaggerated due to the AWD dyno having a linked belt design. That is why it shows up so much on the graph. All of the AWD EcoBoost cars show this as you can see its even on the stock pulls."