Did you guys, by any chance, solve this problem? I have it, too.
I’ve just spent $50 to get a Dura Ace chain…and it’s no quieter than my Ultegra chain. I’ve done everything but change the crank/chainring.
The hanger is aligned, the derailleurs are properly set up. There is no rubbing on the front derailleur. The bike shifts fine. The chain is new; there is only about 2500 miles on the bike and rear mech. I’ve tried swapping the rear cluster with a new one; makes no difference. I’ve shortened a chain to eliminate the rear derailleur and I still get noise off the front chainring.