The answer is absolutely! Case law in Federal District Court has agreed with awarding interest and attorney's fees if your invoices bear the statement requesting such. When issuing Decision and Orders in Formal PACA Complaints, PACA will also issue awards on interest disclosed on your invoice. What you'll want to do is include the interest language on your invoice.
So the question you should ask yourself is, do you want 18.0% interest on your money; or do you want the 0.12% interest the federal government is currently awarding? I know which one I'd choose.