BB, welcome. I'm not familiar with the Mythos 6s, but unless they have a very elevated treble response, the M2s shouldn't fit that comparative description if they're operating correctly. The NRC graphs show a very flat response above the low bass. Have you checked closely to make sure that one M2 tweeter isn't inoperative? Do the two M2s match each other tonally?

By the way; certainly approve of your choice of morning music!

-----------------------------------

Enjoy the music, not the equipment.