If you have bent parts, definitely replace them. It does really seem that the hitch (from the vehicle) is running up at an angle keeping the ball mount from tilting enough back to angle the bars down. Is the tow vehicle and the trailer all on a flat surface? Ideally you are on level ground but for certain the surface under the vehicle and trailer needs to be pretty close to a straight line. If the surface causes the front of the vehicle to be downhill, that could be part of the problem as well.
I also agree you need to double check the mounting position of the DC brackets. That won't fix the loose bar issue. Getting the head tilted back to put pressure on the bars is the fix for that. Ideally the chains are straight up and down, but perfect is not critical. The more off of vertical they are, the more force they put on the DC brackets however as they have to counteract the force of the crooked chains. Yours are far from straight, I'd move them to get the chains straight once you fix the tilt issue.
Good luck.