You might need to learn how to use the lumbar adjustment properly, and I'm not trying to sound condescending. I used to get LBP from my seats until I learned how to use that air bladder properly.
Past:'08 E92 335i|ZPP|ZSP|6AT|four (4) HPFPs
Present:'15 Mustang GT|401A|PP|6MT|Recaros
Sig pic unrelated. I like to go sideways and stuff.