Bluesound mode not really cutting it

I'd probably toss the Mac152 and get a tube amp.

Staying on question, IMHO, Aurender makes the best sounding streamers/servers.  A used N150 or better, an N10 (listed in this forum for around $2,300 and $3,500 respectively where list is always negotiable) is your best bet.  The bonus in buying a used server is that in may come with many high resolution downloaded to the drive on the internal drive. 

@oddiofyl +1 Streamers are all pretty much equivalent. No point in spending thousands of dollars when a WiiM Pro for $200 sounds no different than a four-figure streamer contrary to what the golden ears crowd claims.

You can get a Bryston BDP-3 for about $1.5K used.  They stopped making them but will continue support. Manic Moose interface is antiquated vs the new stuff with apps. Only supports Qobuz and tidal but SQ is not notch for the spend. 

Streamers aren't all the same.   You can buy an Eversolo and get terrible support or you can buy an Innuos or Aurender and get both great sound and support.  

Bluesound is a great platform and sounds pretty good for the money.  Best platform for the price Support is pretty good too.