It is always good to have natural light but I would not have liked people walking behind my stage!
As for acoustics, I do not know as I have not been to your room and I have not seen any measurements of it. As someone who has studied acoustics at school and furthered it and still actively pursuing it (trying to do some academic work on small room acoustics and music listening) I would sadly say that the stuff people do is generally wrong (not talking about your case in particular). When it comes to small room acoustics (all our rooms are considered small room), some people do not care at all, some blame their wife for the lack of applications and some just make the wrong applications... The absorbers in your room should do the opposite of making you miss those small cues. It is generally the wrong type of absorption in wrong quantities and in the wrong spots that causes it. Still, it can also be the excitement of the new sound with less absorbers that makes you feel encompassed with reflections. This may make you believe you have changed the sound for the better, this may pass within a short while or you may get used to it or it may be better, who knows... Without proper measurements it is very near impossible to judge the room acoustics correctly. Please use the right measurements and the right people to read and judge those measurements along your listening. The room for reproduction is not like a room for recording or performance. Those rooms where recording or performances happen need very different qualities and there is some magic to it! but not reproduction or control/mixing rooms. It is also very hard to judge recordings and say this sounds like violin, piano etc. as you do not have a reference on what what the engineer has done with that particular recording.
just a friendly reminder