Not sure why everyone is stuck on the strut bars? They look fine in the picture and the head is square to the tongue. No problem there.
I would suggest latching the stinger in the hitch head on its own (not hooked to the tow vehicle) and try moving it side to side. It should pivot freely or give you a feel if it's binding somewhere.
Do you have any pictures of it hooked up from side on? How many links of the chain are hanging on each torsion bar?
Also wondering about your safety chains. How much slack is in them? Can't really see where they go in the pic but it looks odd that they are in line with the stinger while turned as opposed to straight to the trailer.