The key about the MG34 and MG42 while it got a lot of recoil it doesn't have any moment arm. This means that the recoil doesn't move the barrel up or down but pushes the shooter backwards.
So while the recoil might have been too low in ROHOS it having a vertical force vector makes its behaviour unrealistic.
The question is how can you emulate recoil without a horizontal or vertical force vector.
I asked the same question...