My DD is a RHP. From what I can recall, most of the umps seem to set up shaded more toward her ball arm side. We have done very well on inside drop balls to RH batters or coming up an in with a FB. The screwball can sometimes be tough because the ump cannot always tell where the ball is cutting across the plate, so it can often appear to be too inside. There have been times when we've thrown it multiple times in an inning and just couldn't get a strike call even when the pitches were very well placed. On the outside corner, I'd say the issue we've had has been more when we are ahead and trying to get the batter to chase a pitcher's pitch. Borderline strike calls, but ones you'd like to get. I wouldn't say getting the outside call on pitches thrown for clear strikes (say outer third or outer quarter of the plate) has been a problem. It's been more when you are a ball off of the outside corner (which should still be a strike) or say a ball and half, where it is maybe a borderline call.