Its all down to pad choice.
However they're never going to be great, your car weighs 1.6 Tonnes and has the same brakes that are fitted to a 1.2 Ton FWD A4 1.8T.
The problem is that pads which operate well at the high temps your inevitably going to generate trying to stop a heavy car, are typically a bit wooden when cold.
I have some generic standard pads in my 1.8TQ, on the stock 288 disks, and i find that they bite well around town and even at 50-60mph they still have a sharp positive feel, but stand on them at 80mph on the motorway and they "go off" pretty quickly and you can feel fade beginning to build even before one "stop". Certainly not confidence inspiring.
I'd suggest trying some Mintex 1144's or DS2500's as they're "fast road" pads, you may find they will be a bit wooden from stone cold though.
I plan to change to 320mm S4 spec disks at some point. My winters are on 17" alloys as a result.