Hi Airmalik,
You don't mention your joystick type, but for precise aiming I program one of the spring-loaded buttons on my Warthog stick -when pressed- to centre on the gunsight, go close in (= POV 30), and pause TrackIR. When I release the button, the field of view returns to wide view (= POV 90), and TrackIR is unpaused.
This way I don't have to think too much (a major benefit for me) when I approach my target and need to concentrate my firepower on, say, a bomber's wingroot. When I finish shooting I simply release the button and I quickly reacquire situational awareness.
Like yourself, I found that when leaning in towards my monitor I would lose headtracking. I simply moved the TrackIR sensor off my monitor and placed it on a shelf conveniently about a foot further back and a few inches higher than the top of the monitor. Since I wear a ProClip on the left side of my headphones, the TrackIR sensor is actually placed slightly left of centre so that my head doesn't obscure the sight line when I look sharply to the left.
Hope this helps.
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