1. I work in sports myself (DJ/Music director for B1G and Army Football)
2. The more videographers and shooters I speak with, the more I see that 60p is the way to go. I was ridiculed for shooting in 4K60 on my 7IV and 7rV on reddit. "It's not cinematic" was the primary response. Did you use any other stabilization or were you mono podded for most of your shots?
Also wondering why you choose 640th instead of keeping your shutter angle at 180 degrees and being able to turn down the ISO.
It is great to work in the world of sports. You get to be in the middle of the action, almost.
I understand what people like about "cinematic". You could always tell them you would listen to their advice if you were planning to shoot a movie. But this is sports, and all major sport networks around the world broadcast in 60p (50p in most of the world). Only when it's a sports documentary it would make sense to be at 24p.
I believe the reason for the 640th is similar to not shooting 24p, you don't need the cinematic look. not to mention it would get you a frozen still once you pull a frame out. You will get a lot of motion blur at 120th, as it is literally like shooting a still at 120th.
Personally I believe sports is the best place to experiment new ideas, and PM-R is doing an inspirational work. It gets me motivated to try new things for sure.