from the moment my head touched the rest, more correctly my neck and a smidgen of my skull, the lack of comfort was outstanding.

I know the eva foam is a high energy absorbing material and responds differently to my head just resting on it versus protecting me in an impact but gawd'a'mighty that's a firm rest.

Well worry no more. Since all of tik tok has told me that the first thing that'll happen to me in Quadzilla is I'll die and the second thing that'll happen is I'll die, I've decided that since even some overly long side eye will cause my head to explode like a water balloon, why fight it.  

I broke the headrest down, removed the eva foam and replaced it with some 3" mattress topper foam from an old camping platform project.  rudely cut with an insulation knife and stuffed inside, the results are rather nice.  The foam is under some compression so density is high but still has room to go so my head rests but doesn't sink and in the event of a hit, there is still a lot of dynamic range available.   Bonus points, it makes the wife happy too as she was giving serious fugee face given I had just adjusted the seat foams to firm them upland take the 30 years of other peoples ass prints out, she was very "mmm feels new" and then the head and head rest went thunk! DOH!

Carry headrest improvements