Installed USPS module on 2014-01-26.

Have selected for US shipping:
-1st class parcel
-standard post
-priority
-priority express

During checkout, only the last two shipping methods are offered to the customer. How can I show all 4 methods to the customer upon checkout?

It seems like there is a min weight set somewhere in the system? When I add several more products to the cart, the Priority and Priority Express costs are nearly consistent for a .25 lb package versus a 3.5 lb package.

Karine