Oh so your saying the inner underbody (felt covered) of the pinch weld makes contact first since it is raised with two bumps and they are located ~ 1/2” from the pinch weld, correct?Before getting too concerned about the adapter 'groove' being not deep enough to prevent the edge of the pinch seam bottoming out, feel on the back side of the pinch seam. I feel 2 raised bumps that will take the load first and they are 1/2" or less from the thin bottom edge of the pinch seam. So, the groove doesn't have to be too deep. I wish my explanation could be a little less clumsy, but take a look and feel to see what's there. This is the reinforced area for lifting.
So the outer underbody of the pinch weld does not make contact with the jack/jack stand pad?