Use Modern UI Apps as much as possible, allow Connected Standby to do what it is designed to do (i.e. turn off the screen when you are not using it, etc.), Allow Adaptive Brightness to do its thing. Remember that this is one of the first Connected Standby enabled x64 Core Mobile Devices, S0iX makes the SP3 a much different beast then the SP2 and SP1....most of the tweaks used prior will have unintended side effects...
You want tips, look at the Bay Trail Atom Devices or the ARM Devices....