on R6 setting you should set it in config file and use Vdeg for FOV type . i suggest use fov 82 in game for R6 . it give the same actual fov for csgo 's hipfire and R6 's ADS (1x scope)
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Try not to change the input. Keep it as CSGO hipfire with 1.3 sensitivity. Only change the output. The output will always get the correct value if you do this.
If you match to Zoom 1 and then convert from Zoom 2 using the sensitivity value intended for Zoom 1, then you are converted from an incorrect input. Since the game has many different zooms fovs, and you can only offset the scaling so that it is correct for one zoom state, all other zoom states are going to have an incorrect sensitivity. Don't use these as an input.
'Match at' defines a point a certain distance away from the crosshair where the mouse distance required to rotate to that point is identical at all FOVs. If you set 100%, it will match at the edge of your screen, and the mouse distance required to rotate to the edge of the screen will be the same for all games and scopes.
My recommendation is to either use Viewspeed v2, Monitor Match with 0%, or Monitor Match set to match at the top/bottom of your screen. The 'match at' percent for this can be found by putting this into a calculator:
resolution height / resolution width * 100
Example: 1080 / 1920 * 100 = 'Match at: 56.25 %'
Try each one and see what feels most natural to you, as it is different for everybody.