Welcome to AC! IMO, your system is appropriately balanced and the room looks dimensionally like it would work well. Kudos on addressing acoustic treatment. To address your query about improving your streamer / DAC situation, IMO your front end is really solid with great isolation from computer (Node USB) with your DCC and quality DAC. Not sure if you are using Roon with your Bluesound Node or using DSP. The computing power of the Bluesound Node may be limited for using DSP to EQ to the room curve. Always a good place to start is taking some measurments with Room EQ Wizard (REW) to see what you are working with, from a decay (room treatment) and frequency response standpoint. Happy listening, solid system you have there.