LGD056D, Strange issue but running 20hz above standard

[Blackjack]

Hello, first post as i have just joined. I had a look at overclocking the laptop screen with cru and i must have tried 20 times when it arrived but nothing i did seemed to work every custom res i set was missing after a full restart, i transfered my os to nvme and thought i would try again and it runs at 80hz without fault so thinking it was working i set new values but after applying the settings in the same way i still only have the old values, can anyone tell me what i am doing wrong?
I was told this screen can go up to 120hz and id like to find out since i was already looking around for a new 120hz screen.