Hey Don,
Pretty nice and simple, nice follow thru. You have a good wrist which helps produce the stronger roll. I wouldn't worry too much about opening up so long as you're consistent with it, it actually is another form of wrist action that adds to your power. I would categorize you as being a good mid to a touch stronger tweener.
We have a great bunch of guys here that are extremely helpful and knowledgeable. If you want to keep up on the newer equipment, we have a few younger guys who "apparently" know more on that subject then us staff guys...
Welcome aboard bud...
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Rick Leong - Ten Pins Pro Shop
Track Intl. - Amateur/Pro Shop Staff
Vise Inserts Staff
Trackbowling.com