I've never been able to install doomlords custom kernel without having random reboots at some point, I don't believe its to do with the CPU speed as pimps one was just fine. Simply as it comes after a flash, changing nothing I get reboots. Flashing the advanced stock kernel allows me to use my phone without the worry of it rebooting at a time that I need it, I don't feel that I'm missing out on anything either. Not a solution for the custom kernel per say but certainly one for the stability of your device from my perspective. Changing the settings within safe limits and stressing the CPU will allow you to find your CPU/chipsets thresholds. Keep a copy of the advanced stock kernel on your internal memory invade your phone won't boot.
This question is very opinionated. As mentioned each chip is different as is each persons needs and usage. The two replies above are the best you will get, and this question cannot be answered further...