Mine has done this since new, up to around 1500 miles now. Running with traction control off seemed to fix it. Given this thread, I'm going to try running with it on and off and pay closer attention to make sure it's not placebo effect.
FWIW, my BMW N54 had a similar feel. When I'm commanding moderate torque (~half throttling) with a steady pedal input at moderate RPM (~2000-3000 RPM), feels like its repeatedly adding and removing throttle/fuel/timing. If I had to nail it down, it really feels like timing getting advanced and retarded. Like it's feeling for the edge of knock, then backs off, then advances to the edge of knock, then backs off...
It's not enough to get me upset, or report a problem, probably because I'm acclimated to it from the N54. I view it as sloppy OEM tuning or maybe an artifact of a turbo gasser. Or maybe it pulling out power for TCS. But it'd be nice if Ford did root cause and either correct it or explain why it's to be expected. I should check if BMW ever did a TSB on it....