If that can be of any help to you...
I did a multi-drain/fill over several different intervals throughout the time I owned my 2011 (purchased at 36,000 miles, totaled at 86,000) and only found that clean fluid merely maintained the transmission's shift quality. I found that my best results were after resetting the KAM (battery disconnect, etc) after doing a fluid change. This allowed the adaptive functions of the transmission to get used to the new fluid each time. I changed it immediately after I got it (fluid was extremely dark) and about every 15-20k miles after that. I did take it in several times to make note of undesirable transmission shift quality, and I kid you not, I was told by two different dealerships that I had "one of the best shifting Fusions" they'd driven with transmission concerns.
On my latest fluid change I used Redline D6 with Lubegard Red (as you'll see by checking that thread) with excellent results. I did pair this with using premium fuel for what I found to be the smoothest driving it's ever given me. There's no question that the 6F35 is far from an ideal transaxle, but I think that as long as the fluid is maintained, you should be in pretty good shape. It would probably be wise to add an in-line filter to the unit as a just-in-case sort of thing, but then again, since you're still under powertrain warranty, don't overstep boundaries TOO much.
As much as I loved the car in every way, and planned to keep it for a very long time, I did end up buying an extended Ford ESP warranty to have just in case on the powertrain. Beyond that, it was one of my favorite cars yet.