When "leveling" your washer you are making the same mistake that many others do. Start with the leveling legs turned all of the way onto the washer and only turn them out if needed.

The mistake that everyone makes is they keep turning the legs farther and farther out of the machine until the legs are so far out the machine becomes top heavy. When this happens it does not matter how level or solid the machine is it will walk all over the place.

With all of the legs as far into the machine as you can get them, try to rock the machine from corner to corner diagonally. If it is rocking adjust one of the legs out just far enough to stop the rocking. If you have turned it out too far turn it back in slightly. Don't adjust the other leg out to compensate for the over adjustment because if you keep doing that you will be back to where you are now.

Once you have the machine sitting flat and not rocking tighten the legs in place with the nut on each leg so the setting will not change.