NAD M51 upgrade

Been running a NAD M51 for a few years now and have been happy with the performance. I tried out a RME ADI-2 FS and found it too be too bright, and that it did not match the musicality of the M51. Any suggestions on a DAC upgrade? I'd like to spend <$2k. I'm using the NAD M51 as a preamp as well so I'd prefer a DAC that has remote volume control. Mytek, Chord and Metrum all seem to be highly regarded.
Recent MHDT Orchid purchase is filling my bill for smooth and rich. Sharpness is minimal so far.  So dependent on other system ancillaries. Smoother than Wyred or PS audio for me, but its a bit tubey and has one tube. Transparency can be a fine line for me.   
I have not compared to the NAD m51. Bit running silver DH labs interconnects out of the Orchid. Wish Orchid had XLR. 
Amp = Job 225
Speakers = Ascend Sierra Tower w/ RAAL tweeters
Sub = Rythmik F12
Source = Bluesound Node 2 (Tidal)
Digital Coax cable = Cerious Graphene
Speaker cables = Tara Labs RSC Prime
Interconnects = VH Audio Pulsar Copper
Power Cords = custom made

If the coronavirus were not in full effect I’d hit up some audio meetups in the NYC area and demo some gear. Note that there is nothing bright or harsh about my current setup. The M51 isn’t as resolving as the RME and I found it to be more musical than the RME. The RME was definitely a step down from the M51 from a pure enjoyment perspective. It just sounds, mechanical, like a piece of dry studio gear. I’m not trying to mic an instrument to get the absolute greatest detail so I can carve up a mix. I just want to listen to music.

Has anyone that has heard the M51 found it to be rolled off on the high end?

I had an MHDT Paradisea+ many years ago but haven’t heard their newer models, plus they don’t have volume control and I have no desire to purchase an analog preamp as I’m all digital.
metrum jade has remote volume, if you can find one

sonnet morpheus too, but it is over 2 grand

ayre codex has the sound you seek, it has volume control, but not remote
Thank you for the tip on the Sonnet Morpheus. I think that and the Lumin U1 Mini will be my next upgrades.