USPS uses the Tare Rate and adds weight ...
What is the weight of the Product?
What is the Ship From?
What is the Ship to?
If you edit the USPS module in your Admin and turn on Debug to Logs you can try a quote then look in /logs for the Shipping logs and Zip them then Attach them to your post via the Go Advanced button when replying and using the Paper Clip to Attach to your post ...
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