A TN requires precise, strict-to-the-letter no-nonsense documentation. Pearson DHS has a very strict "enforcement" mindset. They'll write a big DHS on your boarding pass in magic marker at the slightest belief that your TN application is not in order. They can summarily ban you for five years -- no appeal -- if they think you are misleading them.

It's not something to fool around with. I'd hire a Buffalo based TN specialist, and apply at the Peace Bridge.