The DSG clutch-packs are holding ok on mine, but I will still be upgrading to Dodson DSG clutch-packs over the winter.
My clutchpacks have taken more hammer than a fairground strongman test and most with 400lbft or more.
Having said that, some DSG boxes are inherently weaker than others even with similar mods and I have even seen slip on other cars without BT conversions.
Personally I would say 450lbft is the absolute limit for stock clutchpacks with DSG software. Above this you will require upgrade clutch-packs, either HPA, Dodson or SSP. SSP are hard to make work, HPA are very expensive with longevity worries and Dodson are as yet an unknown quantity when it comes to longevity as they are new to the market.