If you're sticking with the NQS then think about the caddy rear mod.
We've been running standard Caliper 335mm rears on the TTRS now for 18 months with superb results, that cars disc size OEM was 370/310 we're running 362/335 and its SO better balanced, feels planted.
Should provide good results on the Golf as the vertical C of G is higher, only really required for fronts maybe 350mm plus for example.
The bill with the RS6 rotors was well ver £800, trying to work on half that, going to sling some on the AKS car and get some miles on them