if your mouse has been set to 10000dpi,
there should be no need to set sensitivities in our APP to 15.
here are the full recommended settings:
1. in-game settings
Options/Controls:
Vertical Sensitivity = 100
Horizontal Sensitivity = 100
Left Stick Deadzone = 10
Right Stick Deadzone = 10
Controller Rotation = Updated
Controller ADS Sensitivity = Standard
Standard ADS Sensitivity = 50
2. mouse
5000DPI/500HZ
3. ReaSnow S1
default config "Rainbow Six: Siege(Updated)"