Never heard of the 29% rule. Cool you found a pleasing ratio in your room.

For anyone tuning in, your takeaway from this should be it doesnt cost a lot of money to get great results, You just gotta work within your means.

DIY treatments and considering how energy behaves is really at the heart of the medium of sound; thats the best way to get there pragmatically. The tough part is integrating it into a functional living space.