Q5 got the ZF, but same 3.0 engine. No idea why. Cayenne share the same powertrain as Touareg.
There are absolutely no tune available for the Aisin, the only thing I could find is the "pre emission fix" flash (which I got).
the post fix transmission flash was soooo annoying. reving the engine up to 3k when cold (typically doesn't shift above 2k), more compression braking, ...
I am currently looking where to buy the fluid; I asked a quote from VW as well (they told me the trans fluid was good for lifetime LOL). Again, oil is the last place I want to "cut" or save money. Still annoying to spend +1k$ on something invisible.
I will get my old oil analyzed (trans and diffs). I know a guy LOL