where do i go from here?

I would think that speaker positioning and new speaker cables should be first things you look at. The Kimber you're using sounds like it's 4VS, not nearly enough cable in this application. This would most certainly restrict the bass, as well as probably being responsible for the "forward"-ness of the upper midrange/lower treble (this being different from the "brightness" the 3.6's are sometimes accused of - not something I would expect in your system if you sit 8 feet or more away), through an false emphasis caused by congestion in this range. The cables aren't up to the power demands, and nothing else in the system seems like it could cause the combination of weak bass and peakiness. Try to go for speaker cabling that would sell new in the over $500 range - I use Cardas Cross between my C-J and Thiels, but there are many good choices that will improve the situation. I would spring for the best you can afford here before dropping the big bucks on new speakers, which will require the new cabling if you get them eventually anyway. You will want to follow this at some point with a comensurate upgrade of your interconnect, particularly between the pre and the amp (again, this is something you would need to do anyway if you you were to upgrade the electronics). I know you don't have much flexibility on the speaker placement, but do make sure that the bass drivers and passive radiators are not positioned close to equal distances from the walls next to and behind either speaker, as this can produce cancellation effects. Also, try to avoid having either of those measurements equal the distance from the drivers to the floor. Even a little movement away from equidistant spacing here could bring some bass improvement. Good luck and happy listening!

Sorry - I must have been writing in my sleep when I posted the above about speaker placement. I just re-read it, and I've got to correct myself. Not that my recommendations are wrong per se, but they don't have anything to do with bass response problems. Bass will be reinforced by moving the bass drivers closer to room boundaries, period. Cancellations can occur higher in frequency, however, in the lower and middle midrange, which should be distributed accross the range by unequal separations rather than concentrated by similar separations. I stand by my cable statements, though! Over and out . . . .