Your equipment is great. It’s the room that is the problem. Take your gear to your friend’s room and then see how it sounds. Or, spend and spend on equipment to no avail.Sounds about right to me.
The Convolution stuff I mentioned cost me $750 for the software service + $100 for a mic. I also repurposed a camera tripod for the mic. You do not need ROON to run this DSP filter. I mistakenly thought you ran ROON. Convolution also works with JRiver ($75) and likely other streaming clients. This Convolution DSP is better than anything any hardware vendor stuffs into their preamps or other audio devices.
I did not know how to use the mic or do any measurement for my small room with big speakers. However, the instructions were clear and the guidance via email was also available. It was simple to generate that measurement data file and then send it to the audio engineer.
BTW - the Sim Audio 860 is a favorite of mine. A very neutral and clean sounding amp. Sort of like the AHB2.