Hi Bobf1717 and Pkubica,
I have the ZP90 feeding the Monarchy DIP Classic (non-upsampling) and DacMagic (at Min filter setting), pulls lossless content from a NAS, and reproduction is fantastic!!! And as Larryski2 says, with a decent cable it's hard to beat. It's a single-zone setup so my ZP90 is wired directly to the router to ensure it can handle the large lossless files. I'm very satisfied with the result.
Thought you may want to try this setup before you dive into more costly mods and options.
Would be happy to hear your feedback whatever you decide to implement.