I had my Frontier and Funfinder set up perfect with my Blue Ox. FALR was 100%, rear sag was acceptable.
Then I added sumo springs because I am also towing my horse trailer fairly often, and was not happy with the sag. After adding the sumo springs, I had to start all over from the beginning with the Funfinder travel trailer. Since I no had almost no sag, the hitch head had to be raised one hole in the drawbar, the head had to be tilted further back, and then fine tune it all with choosing the right link to pick up on the chains. It took several passes over the CAT scale to get it right, but now I have settings for both trailers that work well and get the steer axle weight correctly restored.
BTW, I had to modify ( void the warranty ! ) on the sumo springs by literally sawing "one bubble" off the top of them. They were simply too tall the way they were. They are now correct for this truck and actually I prefer the way it rides and handles even empty with them under there.