Again this could link to tyre's, but I'm interested in the difference in chassis/weight and driving style approach. (Never driven a Sirocco
)
The GTD at present in 0-2 degrees C, I'm constantly short on grip, however when not accelerating it is awesome 
So going round corners - no problems. Accellerating from scratch... slippy as buggery. (Conti's too).
Experienced the same on 19's (dunlop ) in the damp running sport settings , 3 things ,backed the throttle off to
normal ,checked tyres ,Way under Inflated , there was much Improvement ,the rest is down to the power and
Torque , In the Dry great ,plus the temp factor don't forget