there is no best kernel: the best one is the one you prefer... flash some diferent ones, repack them if needed, test them and choose the one which will fit your needs... that will be best kernel.
i've great battery life on sense with lyapota's kernel... try to find out if the aosp version works on your rom, i'm not sure as i never tried
sir what settings you are using
after a couple of test, i've realized that battery life in this kernel is better with default settings, so noop/ondemand and cpu @1.5
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