Are they the next generation style with the close bolstering? I'm not trying to be rude, but are you also a bigger set person? I've seen some posts about this and that combination has usually contributed to it in some way.
I asked above, not to be rude, but there are some body types that just don't work very well in Tesla seats. I have long legs and a relatively short torso, the original Model S seat frames were torture on my back and neck, but the next gen seats (close to the Model X seats) are much better. When I talked about it here, some people said they found the original frame seats more comfortable than the next gen seats.
I broke my tailbone when I was a kid. If I can get enough leg room in a car, I'm fine, but if my knees are above my hips, even a little bit, I'm OK for about 2 hours, then it starts to get painful and on long trips I'll barely be able to stand up when we get there. I don't think about it most of the time because I don't run into things in my day to day life that trigger it very often. Fortunately all Tesla front seats go back far enough it isn't an issue, but I started looking for a new car after a road trip with my SO's Impreza a couple of years ago.
Different people are different shapes and what works for some people won't work for others.