I use 1 finish weight and 1 middle weight on the upper spar, and 1 start weight, 3 middle weights and 1 finish weight on the lower spar. The hole for the dovetail plate is H, and it is mounted around -1 3/4 on the stage.
Your problems may be caused by the fact that your arc is fully open. I like to keep my arc at around 12.5"
Also, I mount my mic on the handle itself. Good luck!