Creaking sound from rear

[white46]

I've been hearing this creaking sound from rear for some time.
It happens when stop and go, and when the car goes over drive way or speed bump in angle.
It's not squeaking, it more sounds like creaking. Sounds like when you step on old wood floor.

I've found similar post where my creaking sounds like. Click on below pic to play video, at about 10sec.


I thought it was rear ball joint, so I replaced that with integral link, but the sound is still there.
Also I've adjusted rear hatch bump stop, but it didn't work either.

Where should I look now?
I'm thinking to replace rear upper control arms (33326770859 and 33326770860) along with rear subframe bushings.

Thanks.