I have never heard of broken-in Purist cables being unfocused, but there are Purist fakes. As for bright, some mostly silver Purist with Ferox not fluid could be a little bright in some systems, my old Colossus RCA with Ferox is an example. It was fine before with fluid, but when the time came to fill it up, Jim of Purist only offered to fill it with Ferox, which, I believe, threw the cable off the balance. Not familiar with Museaus, though.
You could try Nirvana cables, they are out of business, I think, and hard to find.
You could try Nirvana cables, they are out of business, I think, and hard to find.