I personally don’t really see the benefit. It’s just a number and most people understand that a nine and 10 are basically the same thing when it comes to grading. You could end up getting knocked down.
Anything under BGS 8 is no man’s land. Those grades are given so infrequently that it’s hard to discern what constitutes a 5.5 vs. 6 vs 6.5. I agree with others here that you should keep it as is and enjoy it. Or better yet, free the card from the slab and start a really beautiful binder.
The difference between 5.5 and 6 is negligible. It’s not the same as the difference between 8.5 and 9 for example. If you don’t care about paying the cost to grade then crack and submit again.