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Today, I had a "bang" shift from 2-1. The problem is that it doesn't always happen, so the chances of my taking a tech out for a drive to recreate it are slim.

🤣  There are a bunch of Ecoboost guys in the area, There is a meetup at Great Lakes Dragway Apr 8th set up on Facebook.   Right now I have a tune from Torrie, GFB, and Steeda intake, hope to get an IC and possibly the upgraded XDI HPFP by that time.

May I add, my previous Fusion - aside from the hard shifting that had been fixed, I also encountered the "bang / slam" phenomena under the same condition.   FWIW, I just got my MKZ from a garage after a Transmission and PTU fluid exchanges yesterday. I drove to work today and was trying to replicate the same phenomena. Much as I tried - and if I am being very an*l about it - I think all I had was a faint (very faint) nudge, no "bang/slam" at all, more like feeling a just a regular gear change. Now, it was only a 3-4 mile drive. I will try to observe the vehicle's behavior as days goes by and report back.

I get a bang shift if I get off the throttle in the midst of a low-speed gear change also.  But that has happened in every car I've driven in the modern era equipped with an electronically controlled transmission.

Exactly the same for me..as well as 2-1 feeling like I'm being rear-ended and I believe it's 2-3 or 3-4 there's about a second or so delay between shifts where it revs but no power and then it kicks in. 

"For me, it ONLY happens during light acceleration AND while I happen to release the gas pedal before a change in gear completes."   That is exactly what mine is doing!

Seems like there are two different issues mentioned here. I do not have the 1-2 hard shift on my MKZ but I did have the same issue on my previous 2014 Fusion + harsh shift in reverse.   I do have "slam" and I can replicate it almost every time.
For me, it ONLY happens during light acceleration AND while I happen to release the gas pedal before a change in gear completes.  

For mine, I think all they did is check the trans fluid level. They did take it for a test drive, but I also had them checking a rattle. They probably blew off the whole clunking from 1st to 2nd. I will have to take it back in just for that issue, I suppose.

Did we just become best friends? 

Definitely experiencing the same deal. Was there any resolution?