check this vid: FLOW Snowboarding | Video
ah well, guess thats where you got the screenshots from. duh…
picture 1&2 allow you to fine-tune stance-width and/or setback more precisely
picture 3 allows you to fine-tune toe-to-heel position more precisely
the slots in the disk are off-center, so even with pictures 1&2, you can choose between more toe or more heel offset.
it will come down to your personal preference, and if your boots and bindings need toe/heel adjustment or not.
most important (for response and riding comfort), is that your boots are mounted centered on your board. This means that your toes and heel hang over the edge of your board about an equal amount.
Too much toe or heel overhang can result in you sliding out on the snow during a turn, or if you are unevenly positioned, the board can feel odd to respond.
the amount of mounting inserts in your board can make a difference to.
just play around with it and see what works best for your riding, and have fun with it.
teflon is not needed. the screws are stainless steel, and have blue Nylock on them to reduce loosening. Still always check all your hardware before you go riding to make sure it's all still tight!