ALL Ps4s will "wobble" as has already been mentioned in the first post.
You can see that in every vid someone exchanges the harddisk (example: http://www.youtube.com/watch?v=u8_nt2Dwf78 )
There really are only three "legs" so if you press at the right corner, the PS4 will "wobble". There is no story here, just basic physics.












