-
Agreed on the advice about having a more upright seating position, I've been progressively bringing my seatback closer to vertical as time goes by and it's been a great improvement.
Also could be worth doing some stretches for hip mobility, I don't know how you are for flexibility and that sort of thing but years ago I had terrible pain and discomfort which turned out to actually be caused by too much sitting basically and improved hip joint mobility sorted it right out!
Why is the ride height so high? Looks like it's on stilts.
Following Nurse Holidays seat position advice I successfully cured myself of horrible back-ache 2 hours into a journey in the E63 - and sent my right buttock into a deep coma. This is progress, however, as it shows that back-ache is not inevitable. I'm astonished that it's so hard to find a position that "just works" though.