It sounds like your seating position, because there's enough room for taller drivers to fit. I have my seat all the way down, and while it's still not as low as I'd like, I fit fine at 5'10." I sit relatively upright using a proper racing seating position relative to the steering wheel (see Paul Frere or Jackie Stewart driving books), but I make sure the seat cushion bottom is tilted back. That gives additional clearance and helps hold you in your seat around hard turns and may make the difference for you. I've hit my helmet on the roof at one track where there's a bump at speed and one autocross in a similar situation, but otherwise there's never been an issue.
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