Sunday, I wore my helmet at the drag strip and I don't even recall my head hitting the headrest once. I may have been having too much fun to notice such thing however. I have been in my car up to 5 hours in a single trip before and have had no pain/discomfort issues, so I'm with bigcat on trying to find a more comfortable seating position.
Not to hijack, but...my issue with the seat is that I have it set so I'm very comfortable, but that puts the rear view mirror right in my line of sight for right hand turns That forces me to scrunch down just a bit to look under it as I turn...
It took only a little while to get the seat position and seat back adjusted to where my head is about an inch from the headrest.
Now when I sit in other peoples cars im thinking "where is the #@*!+^ headrest?" The headrest is now giving me a good sense of security. Thought I'd share.