It's purely personal preference, like rotating the highback. You'll have to tinker with it and see what you like.
The space is normal, it's also normal to not have space. My park setup has more fwd lean dialed in because I'm using a urathane hb, while my groomer board has a small space because the edge to edge transition is quick on that board so it helps avoid over turning.
Okay, that makes sense and makes me feel better then. I guess it's about preference at this point then eh? I was curious to try and tweak em by changing the position where the high back screws into the binding itself (the hinge area). Will it be bad to have on side of the binding adjust forward, and the other side (of the same binding) further back? Basically...can I twist the highback to make it touch my calf, or will that have negative results?