I think that as the others have said one of the things that might be giving you problems is you not tracking the ball all the way to the mitt. The other, and maybe more significant problem might be that you're not setting up far enough into the slot. Often times when I see a partner struggle with low borderline pitches it's because they're too close to being over the top of the catcher. This causes them to lose a certain amount of depth perception as they look directly down over the plate. Try moving further over into the slot and see if that helps you with the elevation of the lower pitches.
Tim.
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