Hello Cheryl,
There's actually no option to control what's returned from the USPS platform as the Hikashop USPS shipping plugin is only responsible of :
- Sending your customer order information (shipping address, product weight / dimensions, ..) during the checkout to the USPS platform
- Retrieving and displaying data returned by the USPS platform
However, a solution can be to directly add a negative value through the "Percentage" option through your shipping method configuration page to reduce the shipping price returned by USPS.
Kind regards,
Mohamed.