No you don't need to get rid of one, You just don't bring one. If your bowling the same league week after week and bring four strike balls, Most likely there's one ball you don't really need to bring all the time.
Now if you "Want" to bring every ball and have a spare, you get a "Joey Bowling Bag" it's less than $20. You slip it on your bags handle, it holds one ball.
Your right a new ball doesn't fix physical issues with your game.My Rhino goes perfectly straight when I throw at the 7 but my targeting is off. A plastic ball won't fix my aiming issues.
If your rolling a "perfectly" straight ball and your targeting (Accuracy) is off then there's only one fix, It's called practice. You need to go down to the lanes and shoot 7 (or 10's as the case maybe) pins, Lane conditions won't matter if your rolling a perfectly straight ball.
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