Very nice summation and review- inna.
It is possible, quite possible, to mix brands of cabling and get an excellent outcome. No doubt that Tchernov is an up-and-coming brand. Purist has been around for awhile now and has a strong following. Good to read that you are pleased w/ this newest edition in your system. As I have reported many times, so many cables, so little time.
I would be interested in reading about the sound/presentation of the Tchernov once 500 hours in logged.
Happy Listening!