I also use the same WDH with my Avenger 28 BHS. When I picked up the TT from the dealership, the usual setup guy was on vacation so the other guy set it up with the bars parallel to the frame of the TT. It looked like the video.This ended up not transferring enough weight forward. The truck was squatting 4 inchs after the WDH put on. I had a lot of front end issues driving.
I took it back and this time the usual setup guy adjusted it, to get enough weight on the front with my 2 inch front lift , he moved the brackets up a notch and add some washers.
Now the trucks handles the TT really good, no feeling like the front end is going washout or proposing feeling. The goal is to achieve distribution of weight, not bar position.
My unhitched and hitched front end difference is less than 1 inch.