....The other consideration is that rolling roads / dynos aren't that reliable anyway - every plot run is different. I wouldn't take much notice about a few bhp neddies either way - Driveability and driver skill is far more important, the rest is just pub bragging rights. 
300+bhp = pub bragging rights

I've heard rumours the DSG box limits torque don't know about power although I've never seen anything concrete regarding this
Yes, I've heard the same. I've heard that torque is limited in first and second gear with the DSG to aid the launch control function. How accurate this is I don't know. There must be some kind of function like that built into the control unit otherwise you basically don't have launch control.
If you look at Awesome's DSG demo car as an example, it makes huge power at 375bhp, but the torque was sitting at 339lbft. I'd have thought that a manual would make a higher torque level as Gaz's car made 313lbft (although I was sure I saw a 319lbft figure too?) with just the stage 1 APR. It makes me wonder if there is a function in there as the following calcs are done:-
Awesome DSG torque/power 339/375 = 0.904
My car DSG torque/power 275/304 = 0.904
Both of theses are after the maps have been on the car for a while. Initially mine was 290lb/ft but this seems to have dropped over time.
Only a theory, but who knows
