Seat lumbar problem

Hi everybody. I have probably the opposite problem of most people - I HATE the seats in these trucks. Way too much lumbar. I raise the seat bottom all the way up and sit on a pad in my dually and it's tolerable. My 2500hd and Denali I can't seem to move it enough, it always hurts my back.

I've never had these seats apart. What is the number in them? Is it just ilaj inflatable bag? Is it something harder that's curved that I can remove altogether? My 400 has super comfortable seats. And from what I've read, 900 and newer seats are even worse. Any body have any advice?