Hi and thanks for the screenshots.
Your configuration looks good.
It is possible that the problem described in the other thread can be the source of your actual problem.
I am not the expert of the USPS plugin, Mohamed is our expert and he will be available Tuesday.
Before this day, we will continue to investigate on this problem so, do you know the size of the weight of the cart you are testing ?
Do you think it will be possible to us to have an access to your website so we can see your configuration (size, weights, etc) and make some test in the front-end directly ? (you can send us such private information by private message or using the contact form).
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.