Matt. Creek is a good pre-amp. After you changed to Creek, the sound comes off easier and stronger from the drivers. You should toe-in your speakers little more toward you. Or, the listening distance should be further away from speakers.
Still you will have little problem with room reflections because there are more musical information flying everywhere. That is what a higher-end do. You have to control those musical information.
You have few ways to control that problem.
1st, you can put "Imager."(http://www.audio-ideas.com/tweaks.html)------
2nd, you can put long and thick sponge all around the tweeter.(NHT speakers has that on one side of tweeter.)
3rd, You can put "Mi-Horn."(http://mihorn.com/index2.htm)4th, you can put alot of damping materials on walls and ceiling. ------
For 1st and 2nd option, You can control only high freq. For 3rd option, Mi-Horn is 20 times more effective than others. And you can control every freq. For 4th option, it will work, but they are ugly and very expensive.
Another recommendation, Kimber 4TC is not a good cable for your system. I think Cardas or Audiotruth will be better for you.
Happy listening!