Rumbling along.... It would seem like - in edit_orders.php - that it would be smarter to use table orders_products instead of table orders_total, because the former contains real tax values. Assuming one wants to solve the problem!
Forgot to mention that "order totals" is the area, which doesn't work! Every different tax class has the same value. It is the correct value for one of the tax classes, but now it's "everywhere".
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