As for overriding the default UPS shipping would you like to do this when the total of the cart is less than $7? You will need to have the exact criteria and amount to charge figured out before you can implement your alternate charge rule.
Thanks so much for your help.
I've attached the confirm page. Note that the total shipping weight in the shopping cart seems to only be calculating the weight of the 1st item based on my testing so this might also be a problem with how weight is either added or calculated for the eCart object using the "Add to Cart" button.
For the UPS shipping override, I'd like to be able to override the UPS shipping for any item under a weight of 1 pound (because UPS calculates a minimum ground shipping weight based on a 1 pound package so it's providing a rate of 7.44 for an item that only weighs .025 pounds for example). I could also do this by item #, but creating an override that says "If the item number = x, the shipping cost should be y".