Thanks for the great kernel despair. Sorry going to ask some noob questions
1) Am on stock rooted with R15,enabled s2w&s2s via trickster, it doesn't work any fix?
2) what is f2fs?and do I need to flash that as well?
3) do I have to disable MP Decision? Is it useful? It was disabled when I used to use elementalx.
4) Is there a recommended settings for battery and performance combined for N6?
R15 doesn't exist, so I will answer as if this is R13, I recommend you use Kernel Adiutor, s2s and s2w don't often get used, they need to be controlled by flar2's apps.
f2fs is flash friendly file system, it is an alternative to EXT4 which is made for flash storage, EXT4 is more for rotational.
There are 4 hotplugs in this kernel, MP Decision(stock), MSM Hotplug(open source modified MP Decision), Make Hotplug(Franco's hotplugging) and Intelli Hotplug(originally made by faux123, updated and refactored by neobuddy89). These are used to govern how the cores are plugged and unplugged .
I don't really have a recommended settings, I just play around with different things each day. The goal here is to let users customize the phone based on how they feel it should be.