Battery discharges under full load, even though the AC adapter is connected

So I bought the laptop in January 2014 at Media Markt, I am satisfied with the laptop and can relate to the positive comments of my predecessors.
Nevertheless, I would like to highlight a problem of under-dimensioning of the power supply in this or other powerful MacBook Pros.
The battery is discharged under full load, even though the 85W power supply is connected. This problem is in Windows 7 operating more than in OS X. Thus, this mode results in a frequent discharging and recharging the battery and could thus lead to a more rapid battery failure.
AppleCare Protection could not prevent this problem, since batteries are not included.

The installed components consume according to the manufacturer:
- I7 4850HQ max. 47W
- Geforce GT 750M max. 35-40W
and are therefore already above the 85W of power supply, added motherboard, monitor and SSD.
This problem only occurs under full load, but should each be aware of.

The Apple support has no answer to this problem and no grace in every respect. You have referred me to the Apple Feedback page and I may now hope that the developers read the message at all, and only eventually I get a feedback.

By comparison, Dell XPS 15 used in the same or similar hardware and operates with a 130W power supply.

Who wants to have a computer with which you can work efficiently even under full load, should not therefore rely on a Macbook Pro or put aside money for a new battery + repair.