Finally stopped being lazy and after sitting on this guy for a few months, pulled the original short rod out of the hydroboost and replaced it with this adjustable unit from Tallon Hydraulics (no fun doing it once the HB was installed,I took the driver's seat out and laid on my back on the floor)
Less than an hour later, start to finish, I had already installed and adjusted the new rod, inckuding a mishap where I accidentally bent the piece of rod I tried using with the puller for my first attempt, and then trying to get it dislodged.
The superduty has a different geometry to the pedal setup so it ises a short rod from the hydroboost to the brake pedal. In an F-150/Expedition, this leads to a low brake pedal that sits below the accelerator pedal and feels like it doesn't have much room to go before hitting the floorboard. The longer rod brings the pedal back up, and having it threaded for adjustability lets you put it exactly where you want.
In months of driving the truck I never actually ran out of pedal travel, and perhaps it's just psychological, but once the pedal height was corrected, the brakes immediately felt even better and more confidence inspiring. Perhaps lifting the pedal back up corrects the geometry to give you more leverage. The pedal height feels right now and no need to adjust going from one truck to another. Now all 3 have the same pedal height and hydroboost