Hello Senior Leigh, thanks for the great videos.
It is evident that you are extremely methodical and well equipped. I thought I would mention these Urmecch jack stand adapters (https://www.amazon.com/gp/product/B0BJW7DKK6/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1). On my W212 (2013 E550) they provide perfect contact with the Mercedes recessed plastic lift attachment at the top, and my jack stands at the bottom.
Of your videos, the ones I enjoy most are the ones in which you speak - the verbal dimension is a nice complement to the excellent camera and editing work.
Regards, J. F. Bond
why not just do was Leghsr.com did with his jack stand? Does the lip of the jack stand hit the sill panel?