Remember, rebooting, installing apps, testing apps out after a new ROM install to see how they work, all this eats your battery up the first few days after installation. For example, the second or even third day, you may use apps you haven't since a ROM update/install, and so the cache and/or dalvik-cache may need to be rebuilt for that app, or the app may need to do extra communication with host servers to download data you wiped before installing, etc, all eating extra battery.
I've hung out here enough to know I should wait a few days before becoming concerned about battery usage... But this is, like, day three and I was wearing the phone most of the day (ie, not using it much). It's plummeting way quicker than I'm used to. I might restore my last backup and see if things are any different...