If the board is a directional board then the mounting holes are going to be set back a bit. So naturally, if the bindings are mounted in the center holes for each pack of inserts, then they'll be offset.
OK so. So that might explain it. But to be "safe" if I use centre + centre I should get the natural setup of the board?
Then if I want to make it narrow and keep that setup I just move both bindings in one notch?