Here's another reason not to like them
Analysts at BMO note that September 15 is the start of a seasonal drag in bonds. That means higher yields into December.
That's something that could also mark a low in USD/JPY and would be generally risk positive.
The election is obviously going to overshadow that but it's still notable.
The US Treasury will sell 20-year bonds at the top of the hour. The when issued market has them priced at 1.220%-1.210% on the bid/ask.