I very much appreciate the added immersion that 3D sound brings to a VR experience.
As I’ve been using the Bell 47 with my Oculus Rift S, I’ve noticed that the “away” ear seems to actually get to the point of turning off. It is abrupt enough to be noticeable. It’s like when you listen to stereo headphones and one side goes out; it’s just dead.
Other VR aircraft I fly do not have the same abrupt effect. They are more natural.
This might be an area of improvement for you.