My only comment based on the information you have given and my experience with your conditions is: beware.

This is not as easy as it may seem. There are many other issues and factors other than the standard mantra of floating row cleaner, especially in heavy wet wheat residue as you will have, even tilled.

Is this on a standard row crop planter ("Einzelkornsämaschine") or some of the many variations of drill used in Germany.?

Jim at Dawn