I think you answered your own question when you said the speakers are too large for your room and the bass is boomy. Excessive bass energy could definitely give you the perception of less midrange clarity and lack of air and extension.
In fact, it's probably the only explanation that would lead you to dramatic feelings such as "I'm going crazy" and "I'm in audio hell". Your equipment is high quality and would not generate that bad of a sound without some ancillary issue. While your cables could be better, I seriously doubt they are the primary cause of the problem.
What's the solution? Well, you said yourself that your system sounded better with the smaller NHT model. I would borrow some smaller speakers designed for your size room and see how they perform with your new Unison. You should also get a Radio Shack SPL meter and a test tone disc to further confirm the excessive bass energy in your setup. Lot's of eqipment sound flat/neutral on a test bench, but inroom measurements are the only ones that really count.
Good luck
In fact, it's probably the only explanation that would lead you to dramatic feelings such as "I'm going crazy" and "I'm in audio hell". Your equipment is high quality and would not generate that bad of a sound without some ancillary issue. While your cables could be better, I seriously doubt they are the primary cause of the problem.
What's the solution? Well, you said yourself that your system sounded better with the smaller NHT model. I would borrow some smaller speakers designed for your size room and see how they perform with your new Unison. You should also get a Radio Shack SPL meter and a test tone disc to further confirm the excessive bass energy in your setup. Lot's of eqipment sound flat/neutral on a test bench, but inroom measurements are the only ones that really count.
Good luck