[KennyP]

Influence of low speed compression adjustment

Compression adjustment has significant influence on handling and driving behaviour.
General rules are:
A harder compression adjustment on the front axle makes car more precise and more aggressive, whreas a softer adjustment favours more forgiving steering behaviour.
Harder compression asjustment on the rear makes the car more stable on fast direction changes and helps if it has too much tendency to oversteer. On the other hand, softer rear compression makes the rear looser and might improve the handling if the car was too tight or had too much understeer before.
However, too much compression might cause uncomfortable and loud tyre role and/or cost grip.

From KW V3 setup manual.