Dsper - I have long experience with CJ and McC DNA - both are excellent in my opinion. Be careful not to confuse tonal color (CJ=dark) with a perceived problem (bright treble at high volume.) A sweeter preamp might make the problem less evident, as might a different speaker, but the problem has not been addressed.
I suggest borrowing some cables before inserting your CJ, since you know your existing system well.
I suggest borrowing some cables before inserting your CJ, since you know your existing system well.