Well, if we want realism, any head movements to the rear at high g forces shouldn't be possible.
fighter jocks pulling massive amounts of g's just didn't (and still don't) have the strength to turn their head around like that during g's.
Implement this and a poor defender has even less of a chance

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Von Santa
Staffelkapitän 9./JG 54 "Grünherz"
"If you return from a mission with a victory, but without your Rottenflieger, you have lost your battle."
- D. Hrabak, JG 54 "Grünherz"
