You should verify that the hitch is setup correctly. A couple of things to check: when the TV and trailer are straight in line, are the round ends perfectly in the pockets of the WD arm on both sides? With the WD arms hooked up, the front of the TV should be at the same height as when the trailer is not hooked up. The WD arms need a fair amount of pressure on them to do the sway control. As you said you may have to tilt the head to get the weight shift you need.
I have the same hitch and it is great but does take a little tinkering to get everything correct.