Speakers sound too bright.

@rwalsh07  Aside from the speakers, have a look at this site for assessing the room itself.  There  seems to be some real issues you could address around the room size itself.  If it's true the room is 50% of the sound, your 30 x 30 room is not helping?  Cheers.

https://www.acoustic.ua/forms/rr.en.html

Try replacing the metal jumpers with some heavy gauge copper wire and switch back & forth with the Blue Jean Cable from the lower to upper binding posts on the speakers. See is you hear a difference between them.

You were sensitive to a similar issue with your previous speakers. Look elsewhere in the system. 

My experience with ML is they are not inherently bright.  The AMT tweeter dispersion pattern is not sensitive to floor/ceiling reinforcement and you said you experimented with toe-in.  Therefore, I would let the speakers burn in 300 hours before you critically analyze them.  That said, are the metal jumpers the “clips” supplied by ML which are simply a piece of copper, not a shielded wire?  When I had Apogee speakers, they came with similar copper jumper clips manufactured to the dimensions to slip between the terminals.  They had no shielding. The result was a grainy, harsh sound.  My recommendation is to use speaker cable, equivalent to or better than your current speaker cable as jumpers, or better, bi-wire the speakers. Both options improved the SQ of my Apogees, the bi-wire option significantly.  Bear metal jumpers can be a point source for EMI, including RFI, to enter your system which produces a glare like distortion.  I recommend trying this to see if it improves SQ.  Also, the AMT tweeter design has a wide dispersion pattern so I also recommend experimenting with side wall room treatment.  Good luck. 

Clarification:  the AMT design has a wide horizontal dispersion pattern, narrow vertical dispersion pattern. Therefore, no ceiling/floor reinforcement, but possibly side wall reinforcement.