In this case and if you've invested thus far in a project, fix it. Skillfully take a razor to the perimeter of the decal. Use whatever means including a heat gun to help lift it and remove. Apply new decal and blend with a fresh coat of clear.

If still not satisfied, do it all over again but ONLY the complete down tube. And yes, you'll likely curse during the process but its not really that bad of an ordeal. Wishing you good luck-