The closed back Audeze LCD-XC 2021 are an upgrade in every way to the AKG K371 (I own both) except Harman Bass, which can be easily remedied by EQ, due to the extremely low distortion of the LCD-XC 2021I've spent a little bit more time with these and with a good head position/seal I'm really enjoying them a lot with Oratory's PEQ applied. Obviously, I should be happy with this but I'm curious what would be the next step up? Ideally, improving the issues of this headphone like more robust construction, less fussy about position/seal and better spacial qualities with a more speaker-like presentation and less in your skull? DCA Stealth or Noire? LCD X-C?