How on earth you can get 6 hours SOT?
Would you mind sharing more info?
I barely get 2.5h-3h SOT and I tried several roms and kernels.
I am now on CM12.1 nightly, all stock.
I get a 350mah -500mah current discharge on Ampere.
I haven't played with speed or ampere yet.
But simple things like not having Facebook or Twitter apps , I use uc browser everytime I want to check.
2g and wifi most of time...
AK kernel is a good one, but stock kernel of the rom works flawless too.