Aside from Dave's sage advice, here's what I told Brad.
When any symptom is aggravated by posture, there's clearly a mechanical aspect to it's cause. So in this case, the NSX seats (although excellent) aren't providing enough support to the lumbar curve (lordosis). Many, many people have sustained ligament damage to multiple areas of their spine, which allows it to shift out of its ideal alignment, and no car seat will support the spine properly when this happens.
Further, simple muscular problems typically self-resolve, heal, quickly. If a pain or symptom is persisting, especially when it comes to the spine, there is likely ligament damage, misalignment, and if enough time/degeneration has passed neurological symptoms start to develop (pinched nerve etc) preventing it from healing fully.
Therefore - get a lumbar roll for your seat and place it above your hips to support your lumbar arc.
And - if you have persisting symptoms, go see your Chiropractor for a checkup to analyze your spine for subluxation (misalignment), because if it's there, it needs to be corrected asap.
