(let me figure out what I want to say and add to this picture... but right now, just showing how something is majorly off on yours... and mine is on stock ROM)
Ok, So there is something causing the screen to definitely drain the battery more than ever. You mentioned how you removed the "Auto Tune" from the brightness, and that should help with battery life, as it will save a few cycles and changes of brightness everytime you move a few feet or reposition the phone. I keep my brightness on my phone at max setting just as a gauge for you to go by.
I haven't used the phone much today, just a few phone calls, texting, downloading a new game and extracting/installing it, and playing it for a minute. But it has been off the charger far longer than yours, and is doing much better.
Might be an issue with the ROM itself, or somehow an app the is actually keep the "screen awake" even though it might go dark.
My screen has been on for 39Minutes and 45 Seconds it says as well.