I'm sorry, I have a difficult time believing AJK kernel is the reason behind your battery woes. That kernel is very likely the most stable, tweakable, battery-friendly kernel ever made for our device, so if you are getting bad results with that... well, nothing else is going to improve matters.
A few things: stay in your current setup and run Better Battery Stats and Wakelock Detector. Between those two free apps you'll be able to see EXACTLY what's causing your problems.
KK roms take a bit more toll on the battery, and require a lot of tweaking to get things under control, due to the framework changes Google made. If you're worried about battery life you may be better off staying on JB until you discover the real cause of your battery problems.