Im looking for the next upgrade. I'm not real sure which way I want to go Help!

Room acoustics!!!

Slow way the heck down. It all takes time. 

Big thing is your room and getting your ML's setup right. 

@pvmike I owned ML Montis and heard 11A and 13A several times. I would describe the sound as smooth, never in your face. The presentation is pleasant but does not excite nor is it extremely engaging. It’s more about striking the balance and keeping away from potentially crossing over the boundaries. These speakers play it safe  

I think going with a good tube preamplifier like the ARC Ref series will definitely be a significant improvement compared to the preamp section of your streamer but I wouldn’t bet on the overall presentation to yank you out of your chair and cause you to start tap dancing. That’s not what the MLs are about. If you want that type of excitement you need dynamic speakers that can do that.
Just my opinion.

I am looking for a fuller sound I’ve heard ESL 13’s with a Gryphon Mephistopheles and was very impressed. Right now in thinking what I have is on the anemic side

The room and placement are a huge part of the equation

An amplifier better suited to those panels will work wonders.  Gryphon certainly makes wonderful amps and integrateds.  Of my customers, the best match we Have found with MLS is AVM.  The warmth of the MOSFET output stage combined with the raw power of their amps delivers a pretty awesome combo.  
 

I am not a Gryphon dealer.  I am an AVM dealer.