Maybe Dunlop changed something like @durk suggested?
Without TC, the first big slip would have high sided me. After a few more times, I started making it slip intentionally, so I'd kinda know what to expect and how it would feel.
On some roads they were ok, like the Dragon and the Skyway. They grip on the roads in Kentucky was especially bad.
I had to keep my bike in Rain Mode for most of the trip.
Love the BMW. Hate the Dunlops.