I don't notice any difference in the feel of my screen from the sides to the middle, make sure you contact ford with all you concerns or worries, I find it best to send an e mail to the service manager before calling, this way if they say it is fine, but it happens to get worst and worst as your warranty is running out you can prove it was an existing problem prior to expiration. Note I haven't had any problems with for at all with warranty I am just cautious from my last vehicle (not a ford)
Cheers and enjoy your new ride, I love ours.