At this point. It's just a waste of time and energy just to go through multiple phones just to find a good one and knowing that of all the ones you had had uniformity issue. This shows that even if you did get another one, you could luck out or it could be similar to the ones you had or even worse.G9L must be A-grade, G9N B-grade and G9P C-grade then? I have not seen a G9L display yet and it’s been an almost even split between G9N and G9P for the phones I tested, so they must be very rare. You have a unicorn in your hands
I am not sure whether it's worth going through multiple more devices to find an excellent screen. Most look like crap. What are your thoughts?
Just also keep in mind that if you continually do returns at that same Apple store, You will eventually could get flagged for many returns and may be greeted with the store manager.