My Seismic Wave has the same offset, but this is nothing to worry about. In home construction, it is not unusual for beams to be cantilevered as much as 4'. So a foot and an half offset is acceptable on a steel beam. As for 6 point automatic leveling system getting stroke errors, this is common when the jack cannot not extend enough to level the trailer as needed. I found an easy way to avoid this problem.
1) After the tow vehicle is disconnected, start the Automatic leveling process. The front jacks will raise or lower to get out trailer close to level, front to back.
2) As the rear jacks start to extend, stop the leveling process and if it looks like you need to add leveling blocks under the rear and center jacks, do this at this time.
3) Restart the Automatic leveling process and the trailer should level flawlessly.
I would love to know if this solves your problems.
2015 Seismic Wave 310
2013 Chevy Silverado Crew Cab w/the marriage made in heaven, "Duramax & Allison".