Excellent gear to start with, from your room description, more than new cables, have you addressed room treatments? That may make a bigger difference then new cables for your stated concerns.
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I think Glen has a very strong point. You might be able to make quite a bit of difference with some good treatment in that room. I have purchased some of the GIK stuff and it's nicely priced and gets the job done well. If you call or email them with your room info they can offer an affordable solution. Best of luck!