Too damped is lousy for listening.
How do you define "too damped?"
In my experience, too damped is what occurs when typical sound treatments are used. These typically absorb more higher frequencies than bass and are unequal in their effects throughout the spectrum.
An over abundance of such treatment results in a room that is exceedingly unbalanced in its response. This isn't overly damped, but rather selectively damped - in a bad way.
Back to the subjective physical sensation: Interesting that your ears feel stuffy. I don't get this sensation.