The galaxy nexus voltages are lower then other OMAP 4460 chip sets. This being said, I have found reducing the voltage by only 5% does the trick. Also, I personally, haven't had much luck with Franco kernels. Faux makes an awesome kernel that "just works" and is always being updated with the most recent OMAP patches. He also makes a "reset" kernel to flash if you get stuck or are switching kernels.