If you've got more panels then, by all means, put them up. The more the merrier.
I'm losing track of what the question is. Seems you have experience with fairly well treated rooms and presumably you've mixed in regular un treated rooms?
You must have your own idea of where the line is?
With first reflection points done I reckon you could get to know the room/speakers and make some good music.
If you have additional panels, or corner traps, then that's even better.
Sorry for any confusion.
So, what I want to just know right now is, do I use this room, IE: Is it truly good enough to produce release quality music for myself and my label, or no its not and I move my studio into my current bedroom (with sacrifices and adaptations).
*It may help in saying I product Psytrance, and now am getting into making rap beats and also rapping / vocals.