In your opinion of course.
The penny may drop at some point, I won't hold my breath in the meantime.
I would imagine, if you tested the Rega amp I use, amongst others, you would hear no such improvement
Are we there yet?
PS/ did the cable arrive
Thats not an opinion, thats a plain simple fact that cannot be interpreted any other way. Amps that are negatively affected by normal variations in mains quality are defficient in their psu and psrr.
The cable has arrived.