This is how I would handle the situation, and I work at a competing major electronics company.
"Mr. Customer, I'm sorry you are dissatisfied with your product, and upon initial inspection I see nothing wrong with the device (because I honestly don't, what you are seeing is WELL within product discrepancy, you are being EXTREMELY particular about non-issues). I will however replace this device for you since you are unhappy with it. However, I am letting you know now, the device you will be getting is B-Stock and may have more issues to you than the one you are trading in. I will not replace the second one for you unless their is a defect in the manufacturing process outlined in the manufacture warranty. If you are OK with this, I will go ahead and make the switch. If you are not OK with this, I can refund your money or you can keep using your existing device.
^^^^That is if you are within say 45-60 days of your purchase date. If you aren't, then that is your fault for not catching these "issues" in your return policy.
You might see this as an issue, but to 99% of the rest of the world that is NOT deemed a defect. You would be returning just about every product with an LCD screen. Sorry, that is my opinion, not a troll.