Matt,
Wow, you did a real job on your room. Built as you have described, I'm not sure why you feel the need for the additional treatments; especially if the floor is carpeted.
I converted a 3rd garage stall into a recording studio for one of my daughters and did pretty much the same things that you described. It worked very well - too well in fact; the room was almost acoustically dead. I had to remove some of the carpeting and add wood parquet to sections of the walls and ceiling in order to adjust the acoustics. Figuring out how to un-treat the room properly was much harder than the initial room planning and construction.
Wow, you did a real job on your room. Built as you have described, I'm not sure why you feel the need for the additional treatments; especially if the floor is carpeted.
I converted a 3rd garage stall into a recording studio for one of my daughters and did pretty much the same things that you described. It worked very well - too well in fact; the room was almost acoustically dead. I had to remove some of the carpeting and add wood parquet to sections of the walls and ceiling in order to adjust the acoustics. Figuring out how to un-treat the room properly was much harder than the initial room planning and construction.