Grouse, much like elk, are where you find them. By accident and in random spots. So there's that. There are not many ruffed grouse in the black hills. I have seen them but have yet to take one. Perhaps this week. You might define success by seeing one as opposed to killing a limit.
Sharptails will be more likely to be found this time of year, prior to freeze up, relating to water, shade and insects. I find that they prefer hoppers and crickets to grain. Once there's a freeze, they'll switch over and eat sunflowers and waste wheat. I wouldn't spend much time looking in places that don't have these three things nearby. Past that, I look on the downwind side of ridges, toward the crown of the ridge. Not in the bottom like a rooster would be but up near the top, on the downwind side. If a pasture has no water and no hoppers in it, it won't have much for grouse in it either.
