Here are the différence beetwin A3 and TT:
See file : Service_Training_Audi_TT.pdf@ Tony_Danza
So, I think we do agree.
Basicly, sway bars are designed to provide à balanced setup depending on car architecture (weight, weight distribution, and if the car is FWD, RWD, AWD)
Then you get bigger sway bar at the front or at the rear, or what ever.
Then, design or setup sway bar stiffer at the front or at the rear change the understeer/oversteer balance of the car.
But you can have 28mm FSB and 24 RSB and get oversteering biased car.
FWD A3/Golf/Leon need bigger sway bar at the front because 2/3 of the weight is at the front, that doesn't mean it will understeer.
But I do think that smaller sway bar at the front on a Golf is too small.
Stock setup is F23mm/R21mm => Front is 44% stiffer than rear and with 2° of négative camber at the front, the car is oversteering biased even under accélération.
My set up is F28 soft/R 24 hard=> Front is 68% stiffer than rear and with 2° of négative camber at the front, the car is neutral.
OTTIS setup is F22/R24=> the front is 29% softer than the rear.
I'm sure his car is fun and oversteering at low speed or around round-about but at high speed, I think there would be to much roll at the front and, outer front wheel over loaded and then understeer.
It what they say in the review I gave you the link.