Whenever I hit a slump it's usually because I'm trying to do too much with the ball. I start trying to "force or manipulate" the shot.
In reality, we can only play the shot that's there. If you're a righty, move right, pick up a little ball speed, and play the more forgiving part of the lane. Less hand and less muscle out there will bring the scores up almost immediately. Picture yourself as Norm Duke and free everything up. You'll be amazed at how fast you can turn things around.
When the confidence returns everything becomes easier, especially shooting spares. It's true that those who are great spare shooters get more than their fair share of strikes. It's an accuracy thing, if you're accurate at making spares, you're also accurate at hitting your target on your first ball, and strikes will happen. Good luck.
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notclay