I still did not try imilka's CM9 (internet problem) so take my words with a grain of salt but how is your battery when you do not use wifi?
From my personal experience, I got an amazing battery life when I was at home having wifi on and connected all the time, but when out and about with mobile data the battery got hit more than it's supposed to be, the difference was more than an hour and a half in screen on time (seeing most of my screen on time is online here or browser)
Seems like still we need better radios for optimum performance
They use what they can get. Probably it´s the new radio, that eats too much battery. Possibly an older radio would be better if it was working with LP5 kernel ect. Just a thought. Which "KNOWN" radio could we use instead?
LC1/2 modem from the GB releases? Can we use/try these?