-
This... is there any sort of car seat ergonomic setup wizard person you could have look at it? My aunt does it for office furniture but she'd based in Newcastle...
Alternatively there are lots of sensible looking Recaros that would look smart in the front of it if you did want to change the seat but surely Mercedes have done their homework and not put terrible seats in a £90,000+ car.
Have you considered getting your back looked at? Physio, yoga etc etc.