Tried what you suggested, used viewspeed v1 and v2 and now my hipfire in siege is like i have mouse sensitivity at 1000 can do multiple 360's in one inch of movement.
Used exactly same settings as before.
So im trying to convert bf4 sens into rainbow six siege but when i input all the data that i know of it keeps saying fix input.
here are screenshots of cfg files for both games :
https://imgur.com/a/UVj2A
BF4 settings in game :
25 centimeters to do 180 turn
fov 70
4% soldier sens uniform aiming on using only kobras on all weapons.
current r6s
fov 90
mouse sens : 4 vertical and horizontal
ADS : 60I