Move the L brackets up or down to get the bars parallel. Then you will need to re-adjust the hitch head tilt to get the proper weight distribution. No need to remove or move the hitch head on the shank which would change the trailer level as long as it is level now.
1.You level the trailer by moving the hitch head up or down on the shank.
2.You level the WD bars by moving the L brackets up or down.
3.You adjust the weight distribution by tilting the hitch head back or forward (add or subtract washers).
Anytime you adjust #2 you most likely will need to adjust #3. The L brackets should be adjusted so that the WD bars ride squarely and flat on them. You don't want them to ride at the leading edge but flat on the brackets. This is usually accomplished when the WD bars are parallel to the trailer tongue framework.
Barney