I think you should run another test of this but put in the full request on the page as well as the full response from the bindings. This way we can confirm the values that are being sent to USPS.
Also, not sure if it will make a difference but sometimes USPS wants you to do some tests first with their testing server before they allow the production. This should not be the case since we are working with the v3 api which does not allow for testing. Just something else that can be looked into with USPS.