The problem is that the screen savers are the problem. The glass ones can not make a perfect fit to a curved screen. So you have to put up with sketchy adaptations of these glass protectors to fit the curved surface.
If you just go with a soft screen protector.....problem solved as far as perfect fit goes. I use spigen ultra crystal ones....3 pack for about $12....and have settled.
Super Shieldz on amazon has a tempered glass one that is working great for me so far. Easy install, no bubbles, and it doesn't lift off with the case on it.