DAC upgrade from RME

A couple weeks back I inquired as to a preamp upgrade, most likely tube, and received much appreciated advice. I now wonder if the upgrade bug should begin with the RME, although in many circle it receives very high marks. When listening to jazz trios/quartets I notice sharp piano strikes can become quite strident. I’m looking into NOS, R2R dacs with good USB capability. Mojo, entry, medium Lampi’s, Gordon Rankin Wavelength, Border Patrol SEi are a few where I have interest. Not so much the Chinese made R2R ladder dacs.