I use 400 dpi 4 ingame sense

its all personal preference but if you are getting into pro gaming you should start with lowest sens possible, then work you way up until you feel comfortable. Its much easier to over extend your aim or lose control of it with higher sens imo

Precision comes more easily with a slower sense, that's it

if you have the time, sure, but then you might aswell play chess

Yeah well why not just put on acceleration and double up the sensitivity then, with a lil' practice you will aim like a god

oh so 99% of the pro scene uses low sensitivity because its just as easy to be accurate with high sens as long as you practice (we all know pros dont practice)/have skill (obviously they don't have skill)/and are comfortable makes sense. It is science its called muscle memory and you have very little in your wrist and alot in your arm simple as that.

1600 dpi / 6 sens

Damn son, that's a high sens

Its somewhat close to what I used on CS GO, a little bit more maybe.

and I was global rank on cs

Global doesn't mean much most the best cs players don't even play match making.