I don't see any need to switch from Av to Tv or vice versa when going from stills to fast. There's a direct relationship between the aperture and shutter speed and you can see it in the viewfinder. If you're in Av mode and want to raise the shutter speed, then you either increase the aperture or raise the ISO. The opposite happens in Tv mode. Just be aware and always look at your final settings in the viewfinder.
Dave
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