Uniformity requires a single, uniform definition and description of the thing to be taxed, and the way the tax is to be calculated. Tax brackets are so clearly and undeniably in violation of that requirement that any judge who rules otherwise should be impeached and removed from office in dishonor and disgrace.
You can preach to the choir but you have to make the case in court, and you haven’t.
Facts are facts. For nearly 100 years, courts have allowed and government has utilized the ‘Power to Bracket’.
Your argument pathway may be viable but it is embryonic. The FairTax pathway is well designed and far along in development. The FairTax is also Constitutional along many lines including pre-1913 16th Amendment Excise Tax America and is uniformly applied which satisfies your interpretations of US Constitution uniformity.
For more information there’s an important FAQ found here:
http://www.fairtax.org/site/PageServer?pagename=about_faq