Fatigue reducing interconnect?

I am relatively new to this hobby and have assembled a system consisting of Musical Fidelity A5 Integrated, A5 CD Player, and Energy Veritas 2.3i speakers. Kimber Hero interconnects and Kimber 8tc cables complete the setup. While I notice much improved vocals, detail, bass, imaging, and transparency over my previous Adcom/Paradigm setup, at moderate to higher sound levels I am experiencing a brightness in the treble (and upper mid?) region that reduces listening enjoyment over longer periods. As a change of cd/amp/speakers/speaker cable (requires carpet work) is not economically feasible, I am wondering if you have a suggestion for another, similarly priced interconnect that may retain the above mentioned positive qualities while reducing a degree of harshness/fatigue. Thanks.