We need to know a bit more about your game (i.e., ball speed, rev rate, axis point, axis tilt).
But, when I hear that someone is leaving the back row (8's, 9's & 10's), I tend to think that you may be using a ball that is storing too much energy and is being too angular at the backend.
With the strength of these balls currently, we are all going to leave a few back row items. But if you are seeing more than your fair share, try using balls that start up a bit sooner and are less angular. You want the ball to split the 8 & 9, not running over the 8 and leave the 9.
Just my opinion.
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Larry Verble