I will refrain from analyzing the sound through microphones, as that seems to take into account the "recording field."
In my opinion, the position of the piano is wrong both visually and acoustically.
First of all, I would say, you have a real "stage at your disposal." Beautiful.
One never places the piano opening facing a wall. The sound bounces, especially the high notes. Instead, we must project the sound into the environment. Visually, one does not enjoy the best part of the instrument: the curve of the tail.
I see this piano positioned at the back, near the glass window (appropriately furnished with a curtain and carefully opened during the good times of the day).
Naturally, with the tail facing the long part of the room. The sofa will be an excellent listening point. Some other curtains and some rugs will absorb the excessive reverberation, which will already be more moderate in that position. The decor will also benefit: that floor looks like it was made for this!!!! Watch out for the pedal: the wooden platform makes the "change" of the pedal itself more audible. Therefore, change it "not suddenly," but slowly. That's all. Try, by proposing to the other members of the Family, in case they are skeptical, to view and listen to the results of the new arrangement. Do not forget the rugs and curtains. Here too, gradual tests, so as not to suppress the high frequencies too much. The instrument is not of large size and will suffer a little with the crossover and on the lows. The important thing is to respect the "cantabile" that must emerge from these latter ones.
I hope these "practical" tips can be useful to you, even if they are not supported by scientific tests. Of course, being on site would change things. The result depends on the sound power of the instrument, its preparation, its position, the "shape" of the listening environment, and the position of the listener—things you have already well observed and evaluated.
Ciao Paolo
