I suggest going back to the scales and weighing multiple times with different adjustments on your WDH. We tow with a 2013 Expedition EL and on one trip I noticed it felt very 'floaty' to the point it was a little nerve racking. Your feeling 'floaty' because you have removed quite a bit of weight off the steer axle. Go back to the scales loaded as if you were going on a full trip and hit the scales multiple times doing different adjustments until the weight on your steer axle is almost back to stock without the trailer hooked up. I did this and noticed the setting I was using when I had the 'floaty' feeling I was off almost 300 lbs on the steer axle from stock. I weighed up multiple times and go the adjustment on the WDH to where the weight on the steer axle is within 40 lbs of stock. No issues since.
