Two things-
To counter the German compensation board, you might try to find a report that evidently the Australians did many years ago on back problems in helicopters. I'm sure that there are enough ppruner's out there who can also find official reports that will counter this head-in-the-sand attitude.
The second one is that the HH-65 seat was one of the worst I've ever had the pleasure (?) to be strapped into.
I'd suggest that anyone who makes decisions on seats should be strapped into one for a least 8 continuous hours (with only short potty breaks).
And why is it that BMW and other car mfgs can make very comfortable seats??