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Where posture and head movement meet
What actually decides chassis balance from the driver is whether the seat is holding the torso. Head motion on its own is a small mass. Hips and shoulders are not, and if those slide you are feeding a second steering input into the chassis whether you intend to or not.
Once the seat is right, I am not convinced that forcing the helmet still is free. You still need the eyes on the exit early, and locking the neck can make that late. How much stillness is actually worth chasing after the hold is sorted?
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The chassis only sees the driver as forces and moments at the contact points. If the seat locates the hips and shoulder blades, the large mass is coupled to the frame and the load path runs through the seat stays into the rear axle in a repeatable way. Head mass is too small to act as ballast; a moving helmet is usually a symptom of the shoulders leaving the seat, which recouples that mass through the wheel and adds an unintended delayed yaw moment.
Once the torso is held, extra neck rigidity is a visual and vestibular choice, not a handling one. Gaze still has to rotate toward the exit early enough to unwind, and a neck clamped to the chassis either delays that preview or twists the shoulders and undoes the hold. The stillness worth chasing is a quiet torso plus a head kept roughly level with the surface so the inner ear is not fighting the horizon; freezing the helmet past that point is not free and it does not plant the rear.
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once the seat is holding you the helmet is not the big weight. A little turn of the head to find the exit pretty near never upsets the kart if your hips stay put. A fella that freezes the whole upper body ends up slow picking up the next mark.
Reckon the real mess is when somebody unloads the seat going in and then sits back down hard, that spike will talk to the chassis a lot louder than any head movement.
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