Something to consider that I didn't see mentioned was the tire size of the guy you're comparing yours to. Does he have the same size you do? If not, it may be as simple as that for the difference in height. If you're not having any mechanical issues and your angles look good just chalk it up to different truck, different results. One thing you can do it take it to either a 4WD specialty shop for a once over or where I live we have an automotive spring works shop that's cheaper and suspension is all they do. They installed my rear springs and front spindles because I didn't want to mess up the auto leveling air springs.