Benchmark are never going to rate or to tell how good the kernel is...
my first goal is to improve user experience (smoothness) more than just chasing after scores or benchmark results.
But let's just tell you why.... if there's No GPU activity happening on my kernel ...Cpu will automatically limit CPU frequency to a quad core frequency (which is 2.1Ghz... on stock is 1.8Ghz).
Once you starting gaming or doing any 3D activity... CPU gets the full OC potential which is up to 2.9Ghz but you won't see that quite often because Games will use all your cores and by default it will eventually come back to 2.1Ghz during gaming depending to how games uses multi cores.
If you see that benchmarks is the only way to decide if kernel is good or not then... unfortunately it's a wrong way to think of that.
I care about user experience more than anything
---------- Post added at 03:29 AM ---------- Previous post was at 03:26 AM ----------
It is not a requirement to have F2FS
flash the kernel as any normal kernel but if you want to use F2FS.... TWRP must at least support F2FS to be able to see F2FS partions once you converted 
