I hate to be the bearer of sad tales, but I don't like what I read. You may have the pinbox framing starting to let loose. Pull a string tight from side to side in front of the kingpin so you can see if you are still straight - - or is there a gap in the middle of the string? If there is, measure it. Now, hookup your truck, let the trailer load the pin and stretch the string again. Is the gap larger? Also note the amount of bow from being unhitched to being hitched.
If you find you have had an increase in the bow, you probably have failure in the framing in front of the kingpin. Let us know what that little experiment showed.
2003 Dodge HO 6 speed Laramie Dually, Jordan controller, RDS fuel tank, Air Ride 25K hitch
Carriage 36' fiver, Onan 6500, Prosine 2K inverter, 3 slides, MORyde IS and Kingpin