a-d-s wrote:
I am pretty confident that I am well within all the capacities.
I am not. What are the axle ratings and GVWR of the Expy?
they take enough force to pull up that I don't think tilting the hitch further back would be a good idea.
Not a valid reason. Without knowing the above, or the weights of the truck alone and truck/TT without WD applied, It appears as though you are not distributing enough weight to the front axle. The rear axle weight looks high, probably over the rating, and the sagging problem.
Drop the tongue on the ball, latch, then raise the tongue up with the jack to help snap up the WD bars, with or without the cheater bar/pipe.