Saturday in a meetup on the neokyo all nighter, a friend and I could only ride at 29mph. It didn’t matter if we were at 1.1w/kg or 5.5, we rode at 29mph. I think others were benefiting from the same experience too.
When one of us stopped, the the other’s died gradually reduced and then it took 5.0 to barely manage 13mph to rejoin.