I used to play 0.25 sensitivity with 500 dpi I hit diamond easily, carrying everygame and having K/D 1.6 AVERAGE. I took a break from the game and when I came back I wanted to play a higher sens since I had iron movement with 0.25 and could move my POV only 100 degrees from left to right on the mousepad. And here I am with 0.4 sensitivity 500 dpi feeling ultra fast for me. Its been 1 month and still cant aim properly.