Two books by F. Alton Everest should be required reading: (1) The Master Handbook of Acoustics, and (2) Sound Studio Construction on a Budget. In (1), Everest analyzes main room nodes for a room very close to yours in dimensions, and you can see how to do it for yours and maybe change things for the better. (2) is about 10 years newer than (1), and is a lot more up-to-date on RPG-style acoustic treatment. If you want DIY info on those devices, I make them out of Styrofoam and could email you theory-and-practice sheets.
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