Generally higher vcore, and higher VTT you can run lower gtlref multipliers depending on clock frequency and multi for cpu. Setting the right GTL reference voltages is all just trial and error. Adjust VTT and adjust the GTLREF multiplier opposite of each other is what I usually do. If I modify VCore without modifying VTT then I adjust the GTLREF multiplier slightly higher, where as If I modify VTT without modifying VCore I will adjust it lower. Same goes for NB voltage, if the bios has NB GTLREF multiplier adjustment, you need to fine tune it when you modify vNB or vTT.
One other thing that I'll mention is. I always keep vTT higher than vCore. This might sound weird to most but it is actually how vTT is designed to work. It acts as a buffer for vCore during overshoot mainly during power on. If it is actually lower than vCore then there is a higher risk you can damage a CPU from too high vCore. It is also basically a limiter for valid BCLK high. IE. I run 1.43v vCore on my Q6600 G0 and 1.42V vTT in my Rampage bios (which is actually 1.47V vTT when loadline is enabled on my particular board).
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