Oh, the truck rides better than it runs. Ha! I'm kidding. It really doesn't want to start at temps below 35°F. I've got new injectors, T4 kit, glow plugs, etc to install this winter once I finish with some home remodeling. So I haven't worried about the cold start issue. I don't drive it in the winter anyways.
I think once you start driving it, it'll settle a bit. Especially with new springs, it'll take a while. I am happy with my truck's ride, but I still have some changes to make. I have V codes in the truck now, with stock rear springs - with add a leafs, which stiffen the ride quite a bit. I think it rides good but still pretty firm. I have U codes fronts and B codes for the rear to install - as well as airbags to account for the softer B code rear springs - Again, just trying to finish up other projects before I tear the truck apart.
Like Billy asked, what height RSK did you order? I'm thinking you'll drop at least half an inch, maybe more, once you get those brand new springs settled in. It may take a few months.