Semper Fi, for the small white knob, turn it clockwise as you looking direct at the knob.
IMO, if you have too much rock or if the box did not have a straight shot across the length, it will not work. As for tuning the frequency, i suggest to turn the white knob on your controller counter clockwise till it stop. slowly (i mean extremely slow, if you the the knob actually move it may be too much) adjusting it clockwise. Once you make an adjustment, stop and observe for 30 sec-1 min then make another adjustment. Make sure the top part is out of the water. If you have the magnet mounted on top and it hit your canopy or the trim, move the magnet to the bottom and use the suction cup for the top.