Full disclaimer, I'm super new to RPE (I don't use it for training, just trying to understand it) and do not claim to have it figured out.
I usually take what I thought it was in the moment, versus the bar speed, and then kind of split the difference. That said, I have no idea what your PERCEPTION was, but those move way too nicely for me to have said they were 9's if it were me...
Just a bored dude opining on the interweb...