i would not try downgrading your pri and nv just yet. have you tried any custom kernels? if not try netarchy toastmod for sense and tiamat for aosp. i have not downgrade and i am getting the best battery life to date. check out my setuo in my sig. also you can get the kernels in ref#2 of my sig as well.

 

i downgraded, i had to for virus Gengersense, but my battery doesnt seem to have digressed. what you should try doing is flash the update before the rom, reboot ur phone, thatl make sure it sleeps (thats what i read, may apply to w.e rom ur using) and then going ahead to flashing your rom.

(do at ur own risk im not responsible lol, i did it that way in mines and it worked perfectly, thats why i thought i should share it with u)

 

i flashed it after the fact on ginger sense after i realized the phone wasnt sleeping at all. Worked fine just wiped cache and dalvik and went...