Ugh, sorry guys. I am an idiot, in the converter I was not selecting Savefile under location. Previously it was giving me a way too high sensitivity, but after selecting the SaveFile option it gave me the correct conversion. In terms of the stretched screen on csgo, old habits die hard. I don't particularly play the game as much I used to, but I played counterstrike for a long time and used the same sensitivity throughout the years. With muscle memory, it would be a lost easier to convert my cs sensitivity to fortnite to a 1:1 ratio.