Speakers sound too bright.

Is it worth changing out my Blue Jean speaker cables?  I feel like some of these expensive cables are over hyped.  If its suggested not to keep the Blue Jean cables, what relatively inexpensive cables would you guys suggest.  

You have some very good equipment that outclasses your speaker cables IMHO.  I’ll reiterate my earlier recommendation for these Acoustic Zen shotgun bi-wire cables that at $350 are an absolute steal and should be a big improvement.  I sold a pair of them to someone I think was using Mogami or Canare and was floored by the improvement, and these are so cheap if they don’t work out you could turn around and sell them likely for a profit.  Just do it!

https://www.usaudiomart.com/details/650194860-acoustic-zen-satori-shotgun-biwired-speaker-cables/

You said your KEF were too analytical/metallic. The KEF concentric driver is not metallic sounding, just the opposite. It's extended but not harsh at all. So, will will never like the ML ribbons. Send them back and get something more mellow. 

Yeah, if they dont work out, will probably try Lintons next.  For now, I'm going to give it 30 days and make a decision at that point. I have 60 days to return them.

@mvanwoert

I have played with ML speakers for decades and a few things to keep in mind are: 1) They are line sources that radiate in both directions and 2) they are a capacitive load not a resistive load.  

When I looked up the OP's speakers, they are conventional box speakers with dynamic drivers (magnets, coils and cones) plus an unconventional tweeter!  A far cry from the MLs of old ...

Try Kimber Kable 8tc.Will add warmth to your sound.