Fret Level on Cort G250

Fret level on these heavy worn frets, I was concerned there wasn’t enough to get them all level but it came good. The “roller” nut is a good idea for the trem but not if you want to change the string height which in my opinion is now too high. I had to clean the fret board and the trem, which was full of dead skin. I also replaced a missing grub screw and trem spring. It’s a shame I can alter the nut height as other than that this guitar plays well. Also, what’s the deal with the stickers on the fretboard?