Just a comment on those stands. My first foray under the D3 was the same. 4 stands at maximum extension and maximum anal clenching in fear. I bought some 6T (each) stands which are about 3 clicks up at the same height and have additional safety pins as a secondary. I now use those and put a set of backup stands (like yours) under also (8 stands in total).
I set the suspension at offroad height, plus whatever the GAP will allow me, then use a floor jack in the middle of each side to lift it off the wheels before I place my 4 stands per side. I then take long run-ups and give the car a good hip and shoulder from all 4 sides to make sure there's no movement before I get under it with the wheels off.

