I change the shock setting from 2 -> 4, it's stiffer. The clunk noise reduce dramatically, so I know it's not the matter of tighten the top bolt all the way down. Now, the only concern are:

1/. Coils Hitting each other?
2/. Sound from Sway bar?
3/. New suspension settle in?

btw, it's the TOkico Full Coilover.

Any1 with experience, please help. Thanks