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.
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Past: E36 325i, E39 540i, F46 323i (AA tuned), E82 3.0NA, E84/F30 N20 BMS Stage 1, E70 X5 N55, F06 N55
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