ride is nice...very modern safe feel,but above 60mph seems harsh.
i did leave one poly bushing in the rear shackle and my exhaust is
very quiet so actual road noise is more noticeable.
Try dropping the rear tire pressure a bit first, if that don't make it work put 100 lbs in the trunk and if it rides the way you like leave it in there.
After that you will need to pull out a leaf or change springs, I don't it's the shocks.