Hi, out of curiosity, what clock cable are you using? I see you have the good Acrolink firewires between the dac and transport.
I recently added a Cardas LIghtning 15 bnc-bnc (2) between my dCS scarlatti clock and dCS scarlatti dac and transport.
For about $300 per cable, it's a noticeable improvement, similar to what you describe above on your g0s...for not much $$'s