Just got home, let me speak to some of your comments.
You don't really need a custom kernel at all, but they have their good points. On aosp, with an sbc kernel, it can charge your phone more. That can be a plus or a minus, depending on who you ask.
i have Mikg3.0 running on stock kernel. I like it just fine.
Look at Menu/settings/accounts and synch on your phone. what all do you have set up in there to synch? A lot of stuff or what? turn some of that auto synch stuff off and that will help battery, can have it set to just synch when you call the app up.
I also use the free app, Juice Defender. It cycles your radios on and off instead of leaving them on all the time. that is a battery saver too and doesn't really mess with communications unless you choose a really drastic off period. when you do decide to use a custom kernel you can use setcpu to over or underclock, set governors and screen off profiles. those will affect battery life as well. Not to mention what sort of coverage area you are running around in. If signal is weak, will constantly be hunting a signal. see Juice defender app for that.
I would let this kernel settle for a while too. Let your phone go through a couple of charging cycles after trying those things and see what you think. also, do you have gps and wifi on? If you aren't using them, it might save a little to turn them off till you do, not sure how much they use when dormant.
also, 4g doesn't need to be on unless you are in a 4g coverage area and as needed then too.
Glad your phone at least works like a phone, had me wondering there.
Get this rom set up with your apps, use tb and save your apps after they all update, make a nand before you flash a kernel or go back to miui. have a working nand in reserve that way. I notice when I come back to stock kernel from trying a custom one that it takes a bit to settle then too.
all I can think of for now, have a great day. Off to ride bike for a while.
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