Changing Damper force has the following effect on loads
1) With default Damper properties the wheel Hub load is X and the shock absorber mount load is Y (checking the peak load & RMS loads)
2) Decreasing Damper force (i.e.., Damping coefficient reduced by 50%) increases wheel Hub forces to (X+X1) & Decreases the Shock Absorber mount load to (Y-Y1)
3) Increasing Damper force decreases the WHeel Hub force (X-X2) and increases the shock absorber mount load to (Y+Y2)
The Suspension is a Torsion Beam type suspension.
I am running on Rough Road.
Checking the PSD plots shows a maximum variation between 10Hz to 15 HZ in the Vertical direction.
My first thing to check would be the load in the jounce bumper, and the wheel travels. With decreased damper force, you will get increased wheel travel. If the road is rough enough, you will hit the jounce bumpers harder, which will result in higher wheel hub forces.