Try this trick on your next A/X. This may help you stay in your seat more. Move your chair further back than usual, jerk the seat belt so that it locks up (tension), then while holding it with your arm, take your other hand and move your chair forward to your preference. This will make the seat belt stay locked and even tighter and hold you in. It's not as good as a seat harness, but it's free and does help.
As far as your helmet, have you tried a different brand or style? Also some helmets have adjustable pads, this may help with your clearance issue. Another trick is roll up a towel and put it behind your bottom (not underneath) or lumbar area this will make you sloutch more causing you sit lower.
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