I did not find the PSS harsh at all. The PSS is the best tire I have ever owned. What makes them the best is that they have a good tread wear rating but the grip of a summer tire you'd only expect 10,000 miles out of.
I'm not sure, but the PS2 or PS3 (all-seasons) are likely more comfy but with a bit less grip. Look at these or the Potenza 970 if comfort is your main concern. Tire rack has some detailed tests all using BMW 328s.