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If you're after faster shutter speeds then I'd up the ISO rather than underexpose, not do both as either way will introduce degradation so you don't want to have two lots of it.
You could do some test shots at home, you don't need to be shooting fast stuff, anything will do. Take a shot which is deliberately underexposed at say 1/250 sec or whatever (you could check the meter reading then dial in -2-3 stops of aperture), then take the same shot by upping the ISO so that it is correctly exposed at 1/250 sec (up the ISO by 2-3 stops), get them both in RAW and adjust them so they look the same exposure wise & see which one looks best.
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