Master upgrade
As far as I know you can upgrade the master to a T4 transport Master cylinder. This will help with the brake feel. Now I read the 2nd Gen LCAs with the larger cylinder bushing add to understeer.
"note that the Audi TT had two versions of the LCA, there was a recall to make the TT more stable and give it more understeer. The specific modifications consisted of new front lower control arms with larger, softer, offset front bushings, as well as modified front and rear shocks with stiffer compression and softer rebound dampening to reduce weight transfer from rear to front when braking. The front sway bar was increased in size from 19mm to 20 mm, while the rear was reduced 1mm in diameter from 15mm to 14mm. The result in handling was slower steering response, increased understeer, and reduced lift-off oversteer."
This is from the my turbo write up.