There’s so much variance in rooms and their acoustics - I can understand why you’d like in-person technical advice (I have no suggestions). In light of this, you could spend some time submitting the free GIK Acoustic Advice form found here which may point you in the right direction. I’ve found that there recommendations are a little heavy handed in respect to absorption and level of panels, which seems to lean towards pro studios vs “normal” shared listening environments. Members here may disagree with this last statement.
An acoustic engineer or someone competent and experienced in listening spaces would of course be ideal - and something that would have been greatly beneficial for me as well (historically and currently).