In FSX I run much leaner on the ground than in both the C172 and the C182. I don’t use the fine wire spark plugs.
I always lean on the ground, no matter what elevation I’m at.
I'm not sure about P3D, but in FSX you'll have to make sure that controllers are enabled in the settings in FSX. I had the same problem when I got the FSX B-17G some years ago.