I'm talking about feeling all the small bumps and holes, which could be very annoying in Highway driving.
I already changed my wheels from 16" to 15", and my tires from 185/55 R16 to 175/65 R15. It improved a little, but not significantly.
Now I'm thinking in changing my springs for softer ones and adjust my shock absorbers.
On the safe side how much can I decrease my springs K?