For some reason items with a weight over 0.5lbs are going through with first class as the shipping option.
We have to eat the shipping cost to upgrade to priority since USPS only allows first class packages to be 8oz or less.

I should be able to turn off first class using a simple check like:

if($shipping_weight > 0.5) { turn off first class };

just not sure what code to use to turn off the first class option or where I should place it...