THMN26- Welcome Ato Autopia!
Audis are tough, very hard clear (we currently have two and I've had maybe a dozen others).
Skip the #7 for this one, it just sits on top of the clear and
AIO would remove it anyhow.
The 1z PP *might* be strong enough for your marring, but I usually have to use their Ultra for the worst of it, and even that is iffy without a rotary depending on how bad things are. As I said, Audis are tough.
Another option that works well is 3M's PI-III RC (pn 05933) - don't worry, it's milder than it sounds

followed by PI-III Mg (pn 05937).
I prefer how 4-Star UPP looks and slickness (keeps the marring down), but KSG is unbeatable for protection if you layer on a few applications. Zaino might be a bit unforgiving if you miss any marring. IMO P21s is over-rated and if you wanted a "beauty wax"
Souveran looks better on black (again, just IMO).
In any event, I'd use something that provides more protection than the #26. You don't want to be polishing out an Audi very often.
Oh, and check out my "Non-marring Wash Technique" in the HOF, I developed it for my "good" Audi, which I only have to polish every few years (if I can keep other people away from it).