First, are you saying you don't have Airmatic suspension? Airmatic was available for the E320 even in the US with some sports package.
If you don't have Airmatic, there is not a lot of need to reset the steel springs or turn them on and off.
If you do have Airmatic, the springs do stretch out when the car is jacked (so do steel springs) but the car would level once you drive a bit.
Sounds more like you have an alignment issue.