I had a problem with my sct x4 long time ago and tech support had to do a firmware update so i lost the stock tune file on it. And not a long time ago my ssd went kaboom so i lost my backup file tooI use an SCT X3 so I have a .bef file saved. I think you gave enough info to duplicate your ECU. IDK if Sync makes a difference or not or what else might. Just want to say good luck in getting a tune that works. If my 13v6 manual .bef file would work for you, you're welcome to try.
BTW, how did you ever lose the file? I backed mine up many times and places.