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pull the diffuser. you lose a lot of light doing that. Also, rather than bounce, have the light go direct.
drbob and paul, there is a major difference between shooting ISO 8000 ambient, and with supporting lights. Just look at some of Dave blacks work, he regularly shot at ISO 5000 and up and loved the look he got.
Also, in order to overpower ambient, you usually need something more than a few hotshoe flashes. Mono's or packs require external power or large batteries, and other pieces.
I've shot in small college venues before, using only 4 hotshoe flashes and clamps, with the PW ControlTL system. I fit all of that plus my usual lenses and bodies in a backpack. I covered one team, so I shot offense for both halves, and literally moved the lights over from one half court to the other at halftime.
While mixing light leads to some color casts, if the supporting hotshoe lights provide 50% of the ambient, then they temper the white balance well enough that you can still batch it in Lightroom, or use a white balance card and do it in camera.
Is it the best system? No. But I liked that I was able to fit it all in a bag, requiring no lightstands or external batteries (though you could add them if need be). Also, the whole setup was done at one point, rather than several corners, and was easy setup for me to do solo. Especially in some regions, using strobes can still be difficult, due to restrictions by the coaches, team, districts, etc.
Just my thoughts