If you are getting inner edge sawtoothing on the rear you have an alignment problem which is fixable

Do you have the RE050 (directional) or the RE050a (assymetric). I currently have the RE050a on the Octavia (it's basically a hatchback Jetta). Octavias are notorious for inner edge scalloping of the rear tyres but I don't have this problem.

1) get the alignment sorted. The rears need to be set up with a full tank of fuel & any garbage you usually hump around in the boot. Rear camber needs to be reduced from -1.5 (it will be near that) to around -0.5 to -1.0 (degrees, not minutes). Toe should be 1-2mm inwards.
Here's the factory specs but on the rear you need to set it up very conservatively
Volkswagen Golf Mark V & VI GTI, R32 and Bluemotion Wheel Alignment Specifications | my-gti.com

2) Cross rotate the tyres every 7500-10,000km

The reason the tyres are noisy is because the edges are fubar & the tread blocks have a trailing edge feather on them. If you reverse the direction of rotation it will wear off some of the feather. Unfortunatel it will never be "as new" again though.

Toyo Teo & Yokohama Db are both very quiet tyres but they don't have the same performance as RE050a , PS3 or Goodyear F1A2. Sometimes you have to compromise.