Thanks so much for getting back to me and thanks for catching that! 🙂
I tried to apply those fixes, and I even went through the organizer view and compared hierarchies / parents of the bones more times than I could count. I suspect the organizer view isn’t showing me something crucial…
I see an improvement, but that lid still wants to make a big gap whenever I squash it down by the Lid_squash_top and Base_squash_top handles. Did I still not do it right or is there something else going on here?

Work File: https://pasteall.org/blend/ebd4c4e498b84076a6de61e852f70997
Bamboozled again. 🙁
Thanks so much for your help in guiding me through this.