Hi guys, i've recently purchased a guitar with a 'Fender vintage sync'ed trem' and i'm about to set it flat against the body so that it's a bit more stable tuning wise than how it is in it's floating state

One thing that I've read about but with little further justification is the arrangement of the screws that the trem pivots on. Apparently it's best to raise the middle 4 screws off the body and leave the outer two screwed right down to improve tuning stability. Is there any reason for this that someone can forward?