Nice to see someone else taking time to post & analyse waveforms. I can only see your three images in a vertical layout, so I cant comment about ones on the left or right .
Here is one I have from a similar car......
I have noticed a few VAG motors that fail to achieve the "magical" 4.5 volts max at WOT. This one doesn't reach 4 volts.
I even replaced a MAF on an Audi A4 FSI recently due to a sub 4000mv WOT output. Needless to say when I scoped the new one, I refitted his original.
As many others have said, I only fit genuine parts. The job is hard enough, without the added variable of "quality"