For the first time after messy so so so much around roms and kernel, I finally found the best combo for my usage.
My combo: Nothing fancy, just
MIUI8 Global Dev Official ROM 6.7.21 (6.7.29 got battery drain bug),
ROOTED with temporary TWRP, so basically i have no recovery now. And remove some of the google apps that I dont use. Installed Kernel Adiutor to monitor my deep sleep state to see if everything is normal. Oh, wifi is on and off depend on my location availability.
My humble usage:
1.) Facebook (scrolling and video streaming)
2.) Instagram (scrolling and video streaming)
3.) Between (couple apps)
4.) Whatsapp (Lots of active group chat)
5.) Chrome browser
6.) Taking pic here and there and edit with snapseed then share it with my whatsapp group.
Other installed apps but less usage: Qatar Airways (my gf work in qatar airways so i need to track her arrival and things, this apps has push notification so maybe will take off some of the battery), Snapseed, Spotify, KLSE Screener, Shazam, Skype, FB Messenger. (all this apps i had restricted with miui battery optimization, except the qatar airways apps)
My result of battery life?100-1% Battery is about
10HRS SOT. All i can say is, it's the best so far. Of course, I don't stop here, I will make this backup with TWRP Alka (which it can backup all file to have a perfect complete restore for future) before I try any other ROM in the future. All my important notification arrive in real time, i dont freeze here and there anyhow. Just as how a normal phone should function. No gaming thou.
EDIT: Sorry no screenshot, not convenient to post one due to my work place...