Home and Lock Screen represents the amount of time that those processes used phone resources (CPU, memory, graphics, network, storage, screen) that in turn use the battery. The % Battery Usage on my 6+ for that is 27% for the past seven days. I consider that to be fine as I use the home and lock screen frequently when interacting with the phone.
I also have Flipboard, generally use it from 20-30 minutes in the evening. It's using 1% battery for the same seven day period. I have the same settings as you do. May not hurt to uninstall it, restart phone, then reinstall and see if that makes a difference.
03-26-2015 10:56 PM