You will need to upgrade your source component (your Bluesound streamer) to something better. Your Bluesound streamer is the bottleneck and is holding up your entire system setup IMO.
As for Luxman vs Mac I would say it’s a matter of preference. both are great but I found in general the Luxman sounded more tubey with lush sweet highs and midrange and holographic imaging and soundstage, and while the highs are extended but it’s very smooth with perfect amount of details and resolution. The Luxman IMO has better dimensionality, textures and image specificity compared to comparably priced Mac. The music would sound more dimensional with better instrumental/voice textures and imaging with the Luxman. I felt the Mac slightly lacks the last bits of details, resolution, texture and dimensionality in comparison to Luxman. But again it also depends on what type of speakers you are driving. I’m not sure about your Maggie’s or any Maggie’s speakers in general as I don’t have much experience with Maggie’s at all.
My preference would be for Luxman but again it also depends on the synergy between your speakers and amp and other upstream electronics and cables. It’s all about system synergy. There’s no absolute answer in this hobby. Mac gears will pair better with certain speakers while the Luxman will probably pair better with other sets of speakers.