Can you recreate this? If you can make the TC flash at that speed repeatedly then I'd say you have a problem.
My 330 would cut the power at that speed when accelerating with a combination of lane change.
I knew this was wrong.
Then my USB and bluetooth broke. The dealer fixed it and put a newer version of software on the car and now the TC problem is gone. I can now use full power at high speeds and there is no restriction.
Black 330d E90 LCI M Sport Saloon Auto. Privacy Glass, Cream Leather, 6FL, I-Drive/Nav/Bluetooth, Alpine hifi upgrade.