You're welcome.
Is there any way you can test both of your cards in a different brand of z77 motherboard with at least two gen 3.0 pcie slots?

Where would the cards be sent? USA? Canada? China?
If you're willing to send them both video cards, have them issue a UPS call ticket, where they pay a discounted shipping rate.
See if you can get them to pay for overnight shipping to speed things up.
Make sure that they'll cover the shipping and insurance charges both ways.

Let us know how it turns out.
Good luck!!