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Here's a nicely summarized javasource video that Dave Mccrakin from The Fastpitch Zone put together: https://www.facebook.com/phil.mccrak...8610601062950/
Like javasource suggests in the video, get the hips squared to the shoulders by getting up on that back toe going into release. Looking at the pitchers in sluggers' picture, you can see that most are on the point of their drag toe.
Try this experiment: get into the release position with the drag foot on its side and just let your throwing arm hang down at your side. Then--not changing anything else, roll up onto the drag toe. Notice what happens?