Adding to this thread with my experience with the Kimblade wipers. As I said before I've had two bad sets of stock wipers - the ones that came with the Gravity in December and a set that the service center replaced during my service in April. Both were bad, even with cleaning and adjustment.
I got the carbon Kimblades linked here and trimmed them carefully to fit the entire "channel" of the wiper so they sit well but not too tight so they're pinched. I used the included window cleaner pad as long as they sent one. So far it's a major improvement. There is a tiny squeak if the windshield isn't wetter but no chattering and they clean the windshield great. I'll report back after some more long term usage, including the ~2500mi roadtrip I'm going on next week.