Lots of questions. Maybe a few answers from me to start. Lots of times the whole shelf on the bottom is a bad idea if you have a heated bottom. Also remember that your elements start pretty close to the bottom so that space might get heated up more than you would want, warping a shelf-but I can't really attest to that. I do use two half shelves on the bottom at the same 1" posts all around-3 per shelf.I have found over the years that I really don't warp shelves if I am off on placement of stilts by a few inches. I have often done a rotating shelf set up where the shelves and shelf parts help me stack in a spiral. Is it suggested any where? NO, did I have any warping of shelves-no. Did I get all twenty plates/patens and all chalices in the load-yes. I pat myself on the back for those. I fire to cone 6, so I do not put as much stress as someone will at 10. I really don't know how correct I am in my loading of the kiln, but I load solid-no wiggling of post under shelf, entire structure solid from top to bottom with no movement on the shelf when I put a new pot down. I keep my shelves washed, on top, keep them stacked neatly, and have some that from age have cracked that I use as 1/4 shelves or smaller. Some get broken down to use as spacers for things like the spiral stack, or for a spacer for an extra 1/2" or so.
Not a pro, not really trained as none of my college classes early on covered kiln stacking. Later/grad courses assumed you knew, or did the stacking/firing for you. Only one course touched on all of the particulars I felt I was missing, and that was a visiting prof-Ron Gallas. Great experience.
Hope this helps, and does not raise more questions.