It might be helpful to draw a sketch or share some photos of the space as the amount of detail is really hard to envision.
There are two challenges I’m seeing with this. One is that your listening chair is towards a corner, subjecting it to reflections and phasing if there are no treatments. Given your taste in interior design, it might be worthwhile looking into a Synergistic Research Black Box, which is a sleek-looking resonator that cleans up the frequency spectrum in similar ways to adding room treatments. They don’t replace the need for treatments to get optimal sound, but they do help a lot, even with treatments.
The second is your B&O. I think it will be very hard to get the midrange quality with the form factor of the speakers and built-in amplification. That said, perhaps you can keep playing with the positioning of the speakers and your listening chair to improve the room response in your listening position so the right frequencies are hitting your ears better and making for a more pleasing midrange.
Last, I love the Bluesound Node at its price point, as it is very pleasing tonally, but the quality of its clarity and separation of elements in the sound stage is not the best.
Without really understanding more, I wouldn’t want to give you any other guidance. But before considering replacing anything, I’d encourage you to play with your positioning as this can yield some great results.