Are you sitting low or sitting high? I find that sitting low with my legs straighter out I tend to have more back pain, as much as I enjoy not looking at the top of the windshield all the time. By raising the height of the cushion and getting more bend to my knees, my back is much happier.
As a tall guy who tends to have lots of problems with headroom, I automatically put the seat all the way down when getting into a new car. I did this for my F10 when I first got it, but it ended up hurting my back. The other thing I would do would be to have the cushion "tipped" back, i.e. the front higher than the rear. Someone posted on here that they were told that leads to lower back pain. I flattened the cushion out front to rear and raised the seat to give my knees some bend that way and haven't had an issue since.
Sophisto Grau / Oyster - Black Nappa, Anthracite Wood Gone but not forgotten.
Heaven is where the police are British, the cooks are French, the cars are German, the lovers are Italian and it is all organised by the Swiss.
Hell is where the police are German, the cooks are English, the cars are French, the lovers are Swiss, and it is all organised by the Italians