Follow this tutorial (
http://nexus5.wonderhowto.com/how-to...ystem-0156428) to change file systems to F2FS then flash this ROM and the above kernel. Afterwards you can flash UBER (which also supports F2FS as long as it has the ramdisk from this F2FS kernel) and SuperSU etc.
After boot you'll find that OptiPop is even faster and smoother than before with your new F2FS partitions. I am really enjoying how fast and smooth this ROM is now with new toolchains and F2FS. I'm sure you will too