For now, just assume the shift is based off MPH and set the RPM shift at what you think it should be at that MPH. Allow for 600RPM above that and set the fuel cutoff there.
You will need to account for tyre growth, tyre size and overall gear ratio.
Do it this way...
1. scale the final gear ratio and tyre size correctly
2. set the desired WOT RPM shift
3. set the desired WOT MPH shift
4. if it bounces, set the speed shift 5PMH lower
5. keep doing (4.) until it is where you want it
HPT just makes available the table data - they don't define the control logic for the A6 (that's GM's job)
*** just because something is visible doesn't mean it is actually used ***