I read your review.
I agreed with almost all of it.
Except...
The cable doesn't feel cheap to me.
How do you know it is as bad as you say it is?
I'm sure Sennheiser made it like they did to be a premium cable. The kevlar is to help with the linear strength of the cable I presume.
I have not tried to kink it, mainly because I paid $841 for mine with Tax, so I really don't do "testing" on mine. Like stretching, kinking, etc. But because I have some respect for Sennheiser and how they engineer things, I think the cable may be pretty good. It is certainly not bulky.
I do agree that the early ones had some issues with the material formulation because they got hard where they were exposed to oils and salts from Human skin. I am very familiar with this phenomenon on Stethoscopes that spend 99.99% of their time draped around your neck. The early ones had the same problem on very expensive Stethoscopes and the ones made in the last 15 years or so are immune to this.
Your analysis of the sound was spot on.