Nice job, PD. One can always quibble about the assumptions, but your example clearly illustrates how tax costs get passed up the supply chain. I would hope that those SQLs who refuse to acknowledge the validity of the concept of tax costs cascading can finally concede that point. We can debate the magnitude of the costs which get passed up, but it seems to me that denying the existence of the principle is plain stubbornness.
As you point out, the numbers are for corporate income taxes only and they don't include payroll taxes and compliance costs.
They also don't include state taxes, which will harmonize with the FairTax in most cases, creating even more savings for US producers.
You must be kidding, that spreadsheet is out of touch with reality and has already been discredited completely.
Despite their protestations some of them DO understand the mechanisms but they also realize that they CANNOT concede the point and stay in the game.
Unfortunately, your hope will never be realized no matter how well you prove the case.