I'm not a sports shooter so I have a question about the set-up. Why lower the strobes to 1/4 power and have to shoot at the higher ISO. Wouldn't it have been better to lower the ISO and shoot the strobes at full power? Or was the 1/4 power to enable the strobes to recharge faster?
Couple of reasons.
Since the strobes are used to stop the action and not shutter speed, the flash duration on Einstein strobes gets faster at lower power settings (like speedlights). Better for stopping action without getting ghosting (as long as the ambient is close to 2 stops under exposed). And the long throw reflectors are good for about a stop of light getting bounced where I need it over the standard 8" reflectors.
With any other strobes (like alien bees), the flash duration increases at lower power settings. A reason Einsteins are a favourite of sports shooters.
As was mentioned, the 1/4 power allowed much quicker recycle times. Also, I could pop off 3 quick shots in succession without any loss of light.
And, since it was a remote camera, focus was fixed and I wanted to shoot at f/4 to increase my DOF to make sure I got faces in focus pretty much anywhere in the frame.
The cameras I was shooting with on the floor I had set at 1/250, f/2.8 and ISO 640-800 firing the same strobes.