This "crimpling" of the driver could be easily fixed. I encountered similar issues when I was modding my Koss KSC75s and my hands accidentally touched the drivers.
Basically just use some weakly adhesive tape (e.g. scotch tape works well) and carefully "dab" the area with a crimple, then lift the tape off, that should pop the crimple out. If it doesn't just do it more times until it does.
Thanks for the suggestion Jerg, but the point is it should have been fixed correctly the first time. It's like they focused more on the padding than the driver. I'm not going to attempt your suggestion unless things fall through with Sennheiser, but thanks for the backup suggestion just in case it comes to it.