I know that you don't like the idea of having a practically new ball with such a blemish on it, but most times these blemishes really don't alter performance all that much.
You bowling two more games after the scratch and shooting 268-237 show me that it really didn't effect much change on the ball, or it's reaction.
Unless the scratch is directly affecting the roll of the ball, I don't think I would worry about it. Having the shop "fix" it might hurt the ball worse than the scratch does, dependng onhow they "fix" it.
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"The difference between stupidity and genius is that genius has its limits."
Albert Einstein