Well, after spending a couple more hours with it today, I've concluded that anything after BIOS 1.1 just causes instability for overclocking. Most notable NB increases past 2.6Ghz. Also the scaling of CPU Voltage and CPU-NB voltage seems to be far worse with 1.3, 1.53, and 1.54 on my system. I tried unlocking my 4th core with 1.53 and 1.54 and couldn't boot to Windows with the 4 core at stock settings, even with more voltage. So for now, I'm going to sick with BIOS 1.1.