for the taxes, you need to enter both the province and tax rate. to create more tax rules, inspect the existing one, it uses the Bases on session variable trigger:
if the session variable "eCartCheckoutForm_shipping_country" has a value of "CA"
you will need to create additional rules using the same session but changing the comparison value from CA to the correct province code.
for the shipping issue:
on the confirm page, look for the following code:
$Shipping_PackageArray[$Shipping_PackageIndex]["WeightUnits"] = "".strtoupper($yourCart->WeightUnits)."S" ."";
where yourCart is the name of your eCart object.
and change it to:
$Shipping_PackageArray[$Shipping_PackageIndex]["WeightUnits"] = "".strtoupper($yourCart->WeightSuffix)."S" ."";