Hello Kraz and welcome to the community.
Old dogs, new dogs, everyone is on some sort of learning path here.
Your introduction tells us you’re on the right path.
Unlearning previously ingrained chord fingerings is a peculiar experience for sure. Kudos for pushing on and being determined to make them. See if this helps for D minor (or similar exercises for other awkward chords).
I love this. Self deprecation and wit. And a grounded approach. 
Cheers
Richard