My CSL DD shows 6Nm and it should be 8Nm?

This applies when FFS (Force Feedback Scaling) is set to linear instead of peak in the tuning menu. FFS reduces maximum FFB (Force Feedback) output by a small amount in order to guarantee a consistent output between peaks and holding forces, as well as improved general linearity between game output and torque output. LIN activates this setting and PEA deactivates this setting.