I just did on my shocks this adjustment.
The handling is better and the ride is really soft.
1. Lift the car
2. Remove wheels
3. Loosen the small hex bolts on the shock. Don`t use the ACR tool but use a regular hex driver. Otherwize you may domage the screw.
4. Loosen the large ring to reduce the spring`s compression. On the mine the ring is 24 mm from the last thread on the shock.
5. Check that all rings are on the same level otherwize you will have poor bump steering
Check also my site I talk about this:
http://www.geocities.com/andkovacs