Cable / Upgrade Recommendation

I am consider upgrading to new cables for my 2-channel system(Adcom GCD 750 / Morrison ELAD / Audiosource Amp2 bridged / NHT VT1.2 / MIT T2 cables), and I am not sure which cables to try. The system sounds a bit bright, so perhaps cables with warmer characteristics? I understand that the T2 are already on the warm side; maybe I should consider upgrading something else? FYI, I listen to mostly jazz and classical.

Thanks in advance for any advice!