I first learned this by using a feeling of the right shoulder moving almost behind you at startdown. It'll feel like you "punch" something that's back behind your right shoulder. Imagine a clock. At address you're facing 12:00 and the target is 9:00. At startdown, punch the right shoulder to about 4:00.
Yes, I think that was what I was feeling! Crazy as it sounds I think I've been trying to take the side of my right shoulder at the ball - which seems to me to be a recipe for all kinds of disasters, particularly relating to spine angle maintenance. Practicing some pitches in my lunch break, I was getting some good feelings from driving the front of my right shoulder at the target line, some distance behind the ball. Rotating the shoulder rather than sort of sliding it. Felt like I was hitting down on the ball with my whole body, rather than just my arms.
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