Don’t know whether you’ve found the same with yours also being at estate, but when I’m “making progress” the chassis flex at the rear is ridiculous - I can look in my rear view mirror and literally see the back end twist out of square!
I considered a K brace, but as I regularly put the back seats down I don’t want the hassle of having to remove it every time I need to use the full load space. So I’ve just picked up one of these bad boys:
www.ecodetuning.com
I considered a K brace, but as I regularly put the back seats down I don’t want the hassle of having to remove it every time I need to use the full load space. So I’ve just picked up one of these bad boys:

Eurocode 8V/MK7 MQB Rear Chassis Brace
Our Rear Chassis Brace is designed to tie the left and right inner body assemblies together, adding additional rigidity to the chassis and upper strut towers.
