@gregjacob - I’ll mention this only in the event that you are not aware of this regarding the Mastersound 845 "Tube bias is factory-set and mustn’t be altered, Ferro stressed, except when changing tubes. "Biasing ... is usually unnecessary for the 845 because these tubes usually work for a very long time. We have our own design of auto-bias circuit that maintains the tubes’ value constant during [their] life. Our triode amps are set at the factory and only need be set again when the power tubes [are] changed." Tubes should, consequently, only be changed by a qualified technician. ". I don’t know if not being able to set bias yourself is an issue for you. Also, the amp comes with the baseline Psvane HIFI series 845 which is a decent 845 , my Line Magnetic 518IA integrated (precursor to the 845IA mentioned above) came with it but their are better 845 tubes.
Also, just simply for context I have Deadalus ArgosV2s which are 97DB vs the 95 DB of the Muse, and the 22wpc of either the LM518IA ( 845set) or 22wpc of my Finale Audio 7189MK2 7189A/EL84M (pp) integrated drive the Argos effortlessly so you shouldn’t have any worries with the Muse. Also, I believe that the Wolf’s have been driven at shows with New Audio Frontiers set integrated amps by Colin King of Gestalt Audio in Nashville. the NAF integrated amps are very well built and nice sounding.
One last thing, Trafomatic's Rhapsody integrated amp is 20wpc 300B. I haven't heard it but below is a link to a bit of information on it from Atlelier 13's website should you be interested in taking a look
https://www.atelier13-usa.com/trafomatic-tube-amplifiers
Best of luck with whichever integrated or separates you choose.