Sorry in fact i was talking from wrong car, CFGB is only 350NM. But CFGC is 380NM. I only want to say that there are also cars with more then 350NM limit, and i still doubt the temperature map is limiting to 350NM. I never touched this map and never had any limitation, so i expect this map is active "from" 138° or there is another single temperature value to make this map active first.

I never tried to cheat engine torque output because it simply makes no sense, these DSG are easy to read/write since many many years. I understand you say it´s working, but you can say nothing about clutch wear over lifetime or stress from oil etc. Sure the controller adapts microslip, but then better bend torque output instead of making hard cut at 340NM...

There is nothing subjective.
If you reduce MDNORM from 500 to 340 on any DSG box, the feed-forward will be insufficent and the clutches will be CONSTANTLY in the microslip adjustment.
They will be slipping much more than the microslip target non-stop all the time on any increasing torque gradient. Adaptation will also do jack shit, because while on increasing gradient the control will be constantly undershooting, on decreasing gradient it will be as well, as they will be grabbing too hard and the adaptation cancels itself out.
To even suggest such a thing is "okay" means having ZERO knowledge of how the DSG regulates clutch pressure.

If you want to cheat torque a little on the top-end (and you will still have slip issues, but at least not in all daily driving), there are much different methods. You should never ever change mdnorm on any DSG box to underscale reported torque, if you care at all for the longevity of the transmission.

Just because you don't see it slipping 1000 rpm, doesn't mean it's not there.
I really suggest educating yourself a little more on how the microslip controller and the feed-forward works before making stupid statements that someone is going to take for gospel and damage their gearbox.

It was never neccessary to change MDNORM, even then it was always enough to smoothly underscale the torque at the top end a little.
MDNORM screws everything up, also in normal driving.

Bumping this because i stumbled upon it after already going through this issue for a couple months. Eventually i figured it out... But this would have been very helpful as a beginner in DSG tuning.

Interesting topic and i also could not wrap my mind around this but have much better understanding know.
Increase MDNORM to 450.