USPS Shipping charge error

Sorry about the length of this thread but I don't know how to explain it any more simply...

I had a fully functional cart using UPS for shipping. Client asked to change to USPS. With phone help from Ray we resolved all my issues, but a new problem now exists that I had fixed with UPS, but I can't remember how to reset that for USPS

The shipping charge is to be based on the quantity of items, not the actual weight of the items. Thus, 1 item is considered to weigh 2 lbs, 2 items weigh 3 lbs, 3 items weigh 4 lbs. So the shipping weight is Quantity + 1.

Unfortunately I edited the eCart object and deleted the UPS "Shipping" section before I made a note of how it was written. Now I can't figure out how to add back a shipping rule for USPS. Also, in the "Calculations" rules I set "TotalWeight" to "[Quantity]+1" as well as "boxWeight" to "[Quantity]+1" because I assumed that USPS would look at one of these to calculate shipping.

However, what's happening in real time is that the shipping quote coming back from USPS is now twice what it should be (for 2 items), or 3 times what it should be for 3 items. i.e. to ship locally, 2 items should ship for $5.90, but what shows up on the Confirm page is a shipping cost of $11.80.

Please help, these fixes have dragged on for so long and this looks like the very last thing to fix before we go live...

I have created a support ticket so we can look into this issue further.

To view and edit your support ticket, please log into your support history:
supporthistory.php

If anyone else is experiencing this same issue, please append to this thread.

I assume the problem is in the following code snippet from confirm.php, if not can you tell me where else to look?

while (($Shipping_Packaging == 1 && !$proResCart->EOF()) || ($Shipping_Packaging == 0 && $Shipping_Counter == 0)) {
if (WA_eCart_USPS_IsTrueValue("true")) {
$Shipping_PackageArray[] = array();
$Shipping_PackageIndex = sizeof($Shipping_PackageArray)-1;
$Shipping_PackageArray[$Shipping_PackageIndex]["eCart_Quantity"] = (($Shipping_Packaging == 1)?$proResCart->DisplayInfo("Quantity"):1);
$Shipping_PackageArray[$Shipping_PackageIndex]["IsPackage"] = "true";
$Shipping_PackageArray[$Shipping_PackageIndex]["Quantity"] = "".WA_eCart_FormatNumber($proResCart->DisplayInfo('Quantity'), true, 1) ."";
$Shipping_PackageArray[$Shipping_PackageIndex]["WeightUnits"] = "".strtoupper($proResCart->WeightSuffix)."S" ."";
$Shipping_PackageArray[$Shipping_PackageIndex]["PackageWeight"] = "".WA_eCart_FormatNumber($proResCart->TotalColumn('boxWeight'), true, 1) ."";