TJW, If you look at the set up, the truck is sagging in the rear and the trailer is sagging in the front. Tightening up the WD hitch will better distribute the weight, if you can picture picking up the rig at the hitch so that the whole rig sits as level as possible front to rear. Look at the body line on your truck and project that rearward onto the trailer, it should be parallel, yours is way off:
Start by taking up another link, you may need two, but start with one and re-measure. As was noted you may also have to adjust the hitch head to keep the spring bars parallel to the TT frame.
Another thing you can do is measure the distance from the TT frame to the ground at all 4 corners, that will tell you if the TT is sitting level.