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