Delta Bravo, while your flight plan is sound, you need to adjust your angle of descent. The Cornwalls "are in another league completely than the JBL 4429s?"
Really?
Sorry man, I'm not buying what you're selling. I think it's great that you're deliriously happy (for now) with the Cornwalls but you proclaimed that you were deliriously happy when you bought your "endgame" JBLs too.
Personally I like both speakers but would reverse the order of preference.
Hey, I hope you've found your "final pair." But given your fickle history, I don't believe for one moment that you have.