Try the Performance Profiles, the Power saving one will bend the device to its knees when you absolutely need that battery life.
How well does this work with the incorporated battery saver on stock lollipop. Is there any benefit in using it? Or do you disable it altogether? Is there any benefit in running both or just asking for trouble? Thanks for the opportunity to run the best kernel on my Nexus, held off on rooting it as there was no point until now ???