
That looks like it'll be an improvement. Consider doubling up your corner bass traps (one on top of the other). I'm constructing mine today at 3'9" tall each, so I can stack 2 and fit under the ceiling height.
Since I will be hanging the treatments in front of the corners (about 2 foot in front of the corners in front of the bookshelf), would that help the bass treatment?
If your traps are only 1 ft wide, hanging them 2 feet in front of the corners would mean about a 6" gap on either side? I'm pretty sure you need your traps to span the whole corner, or sound waves will escape.