Welcome to the thread Goldfish.
On other boards, a GTL Ref of 65-67 is generally recommended for Q6600 overclocking. Note that I haven't yet played with GTL Ref on this board yet, so I can offer no direct experience. I would recommend however that you up the GTL Ref and see what results you have.
Also, you may find better results with higher FSBs if you set the FSB Termiantion Voltage between 12-15. Note that on the shipping BIOS, I experienced no FSB holes between 1333 and 1600, but I haven't yet done further tests to try and stabilize at 1600 / 3.6ghz.
Also, which BIOS version are you using? People are beginning to see better results with 1.1B4.
EDIT: Lastly, what is your Q6600's VID and batch number?
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