Fascinating thread. A pleasure to read supportive comments, most without sarcasm or rancor.
Dima, I feel for you. Good luck fixing your pinky problem--it sounds like you're on the right track. The fifth finger is an odd one, for example, my right pinky wants to extend and hover over the keys when I'm not using it, but my left one never does that. It doesn't bother anything, but how odd that it seems to have a mind of its own.
Andrew, your blog link is interesting. You mentioned Richter in there, how he never had physical finger problems. In a bio I read about him recently, he did state he had concerns creating good piano/pianissimo, and at the beginning of his career, at least, he had issues with harsh fortes.
Also a big guy with big hands, I have similar issues--no strength or physical issues, but hard to coax great pp out of the keys. Unlike Dima, my fingers make perfect curved hammers--perhaps I need to try some carrezando, though, whether in flexion or extension (as suggested in Andrew's blog), I'm not sure.
For those of you, who like me, were unfamiliar with the term carrezando, here's a site with a good definition:
https://www.legacyweb.rcm.ac.uk/cache/fl0026842.pdfGlenn