Have you turned off traction control to rule out that its not simply trying to wheelspin and the traction control is kicking in? Also, what gear are you doing these logs in? If im reading your chart correctly, the torque drop is happening at about 4000rpm which is when the Golf R is really starting to pull hard - especially with a tune.
Another scenario is that you are hitting a torque limiter in the TCU software. Im not sure what TVS do in relation to the torque limiters in their software, but when you are running different software for the ECU and TCU then its possible that the Galano ECU tune is pushing more torque than what the TVS TCU tune is allowing......or something isn't quite meshing correctly due to 2x different software brands. I would advise not mixing brands when it comes to ECU and TCU tuning.
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