Regarding tire pressure:
When I took delivery on my Soul +, the tires were inflated to about 44 pounds.
When I reduced that to 36 pounds, road noise decreased.
At a dealer seminar this week (Friendly KIA of New Port Richey), we (new KIA owners) found that KIA inflates all tires to 44 pounds so that the tires will not develop flat spots during their stay on the lot before they are sold. Before delivery, tire pressure should be decreased to spec.