Root and stay stock or ROM?

I am new to the N6 world and I am not happy with the battery performance getting around 3.5 SOT and max of 12 hrs of overall battery usage. I am so tempted to root, CM12.1 and Franco kernel. But I am hearing bad battery results with CM12.1. I know everyone has different way of usage but if you can share your experience it will be great. I have three pus email accounts one is exchange, twitter, instagram, Google+ (manual sync), screen brightness is 10%, no adaptive brightness, no ambent display, no location, i use Google now, rarely play games, dropbox, Google drive, one drive, turned off all Google sync except for contacts, calendar... etc.

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Sent from my Nexus 6 using Tapatalk