You: Pretty good. You tend to stand up at the release point a little, you'd be better off holding your position at the foul line. In combination with this lift of your body, you also accelerate the ball through the release point. This has the effect of making your ball more angular, but also less predictable. One way to stop this is to find a "trigger" word you can say to yourself as you release the ball that tells your body to relax.
Not you: A more definite pushaway should eliminate the "need" to lift the ball in the backswing. He also, like you, tends to accelerate the bal through the release point and has that little body lift at the line, probably as a result of watching you
. Also, if you look in Bowling This Month last month, there's a little piece on approach development that would be useful, also available on
this site, specifically, the section regarding stepping across on the first step (tightrope). This odes the job of clearing the right leg to allow the ball to swing through.
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Reporting from England