The coupler is the round socket thing that the ball on hitch fits into. Your A-frame will be about 6" tall. Your coupler is mounted on the lower elevation of the A-frame. Most trailers these days have the coupler mounted on the upper elevation of the A-frame (6" higher than yours).
Setting up a WDH is different with a bottom mounted coupler. You should read through the instructions for the brand of WDH hitch you have and it should tell you how to do the setup for your type of coupler. If you don't have it, you may be able to find it online.
Have you measured the before and after heights of your front fenders? This will give you a pretty good idea if you have the WDH set up right. Typically you have 3-4 links left over on a top mounted coupler, but have no idea what it should be for a bottom mount one. Normally you want the round type spring bars approx. parallel to the ground and this it what you should aim for with the front fender height where it should be. The best thing you can do eventually is take your TV and trailer to a scale to confirm setup and to get some other info.
It does looks to me though like your bar angle is not set right.
