Your settings need to preserve both fast building/editing and precise close-range aim.
Open interactive TapLab ↗Performance Mode is a strong max-FPS option on many competitive PCs. DX12 can behave differently by hardware and may be preferable for some systems; benchmark both.
Start around 800 DPI and tune hip-fire, ADS and scope separately if precision suffers.
Disable motion blur and prioritize stable frame times. View distance is a visibility-versus-load choice.
Competitive vibrance can help separation, but color-blind modes are preference tools rather than mandatory competitive settings.