I don't have this problem on my 5%.

 

Yes, had this issue with my Maxima at 18%, and expect to have the same issue with the G at 30%, although not so far. Think it became worse over time in the Max, as the rear window defroster was used during the winter - don't know if heating stretches the tint or what?

 

It seems like you just have to tint it dark enough to avoid those lines.....