I was really dissappointed in the first of the "Second Foundation Trilogy". The other two books were better (and I noticed that passage you quoted there), but I feel like "Foundation and Chaos" and "Foundation's Triumph" had to spend a lot of time to try to fix the problems from the first book (wormholes, really???).
If you're disappointed with those, I highly recommend reading Psychohistorical Crisis by Donald Kingsbury. Sadly, it's not a licensed book, so all place names and characters have been changed, but all in all, I think it's more in spirit with the rest of Asimov's work than the actual Second Foundation. It was released around the same time as the Second Foundation trilogy, so I'm guessing that's why it didn't get the blessing of the estate, but to me it absolutely captured what made Asimov great.