I will offer that the seat design, coupled with how the harness was attached to the seat/seat mount assembly, is why a colleague of mine died in a Seahawk in 1989. Dolfin summed it up best.
I find that there are good seats, and there are bad seats. Unfortunately, the good seats are terrible.
The SH-2F was OK, the SH-60B seat bloody uncomfortable. I walk with pain each day that I get out of bed, and I am not yet sixty. I can mitigate this with some of the exercises the nice physical therapists offer, but the root cause isn't something they can fix.