Aesthetix Rhea and Calypso Tube rolling-what did you do?

Hey all!  been having a blast with the Calypso and Rhea here, both in signature versions.  Have a Stradivari v2 cart fronting that and looking to start rolling some new NOS tubes in both units.  Price really isn't 'too' much of a consideration.  I am happy to experiment and play around some here.  That being said, the list out there goes far and wide, and deep.  Looking to add a bit of warmth but keep the top end as airy as i can here.  The units are a bit dark and seem to roll off the top octaves just so slightly.  Bass isn't bad, not last word of slam and could be improved on probably as well, but far more concerned with midrange and top end dynamics

Would love to hear what the community has done with their units and how you got to your 'sweet spot'.  Thanks!