Amen, brother! I have an '07 ZX3 SES that I've owned for 5 months that apparently has the same seat as yours and it is undoubtedly the most horrible seat ever put in an automobile! I recently made a 2200 mile trip in it and by the midpoint I was contemplating ripping out the seat and replacing it with a milk crate! I've no doubt that the Marquise de Sade is alive and well and is designing Focus seats.
A friend's 2010 SES coupe has decent seats. If anything a bit overstuffed, but that beats what we have. If anyone has done seat transplants PLEASE let us know what might fit our cars!