Got it, that video helped a lot
Added it now, but there is no function to automatically find the correct DPI, so do like this:
First calculate your hipfire, like in this example:
https://www.mouse-sensitivity.com/?share=48345d4255a991b992a7cf443a8c541b
Hipfire is 4 here, so now select ADS, and adjust the DPI until you get 4 for ADS as well:
https://www.mouse-sensitivity.com/?share=699e869ef2413a7f49f68eba62fde4b6
Unless you know your mouse driver supports lower, do it in steps of 50. For instance Logitech lets you set in increments of 10, but will round to the nearest 50. Some driver do support 10 or even 1 DPI increments though.