Hi,
This is a link into the book online:
Der-Bombenwurf-Teil-1-Grundbegriffe-des-Bombenwurfs
On Page 17 is a drawing, introducing the parameter "Rücktriftwinkel". This is the additional displacement to the back caused by air resistance. On the bomb sight of the He-111 is a dial for the Rückdriftwinkel but it is not functional in the simulation. On page 21 is a table and a graph to get the Rückdriftwinkel depending on altitude and speed. The values are different for horizontal or vertical mount of the bombs (see page 19).
It looks to me as if the Rückdriftwinkel is not simulated. To get this fixed would need one additional parameter simulated on the dial and in the lotfe plus a graph or table with the values available at the bomb sight.