Watching the ball go through the pins can give as much if not more information than what you leave. From what you are saying, it seems as if your ball may have been rolling out as it entered the pocket. When your ball rolls out, it will hit the headpin then deflect to the left (left hander) and hit the 2 pin more directly. This will in turn make the 2 pin barely hit the 4 pin causing it to fall into the gutter with no energy and not coming out to hit the 7 pin. You might have had some 10 pin leaves and possibly 5 pin leaves with this type of reaction. You will see this when your ball leaves the pin deck while moving to the left, even left of the 8 pin. When the ball is driving too hard, you will see the ball leave the pin deck to the right directly into the 9 pin, possibly leaving those "crush 8s". Ultimately, a ball leaving the deck moving straight back and going in between the 8 and 9 would be somewhat ideal.
As for the 6 pin leaves, could just be a case of trying a little harder to get better carry causing the ball to drive a little to high, leaving the 6.
If you can't see what the ball is doing as it leaves the pin deck, just have someone watch it for you. That combined with how your ball reads the lanes will tell you a lot when you are having trouble carrying.
I am not a pro-bowler, but I do play one on BallReviews.com
Edited by spmcgivern on 3/8/2011 at 11:00 AM