Easiest and simplest way I have found to set a plow for the furrow, is to put a block of wood (8" block if you think you want to plow 8" deep, but I set for 6" furrow depth) under the LEFT wheel (front and rear) while the tractor and mounted plow are on a flat surface such as a concrete pad. Then lower the plow to the concrete and adjust it so the bottom of the plow rests flat - right to left and front to back. Also set the plow to follow behind the tractor such that the right side of the bottom of the plow is about 2-3" from the inside edge of the furrow. You want the 14" bottom to turn about 16" of dirt over into the previous furrow. The 2" is to hold the dirt while it is being turned.
The top arm will level front to back, and the right side adjustable pin will align the tracking and the level of the plow bottom right to left (also use the right 3pt lift arm adjustment to level right to left).
While actually plowing, lengthening the top arm to tip the leading tip of the plow down a bit may be necessary to keep the plow in the ground.
A good draft control system will help keep the plow at the correct level, but CUT's usually don't have this control. With it, if the plow starts to bury itself because of hard ground or clay, and that causes the wheels to spin down, making the plow go deeper still, then the draft control senses the compression on the top arm and lifts the 3pt until the compression on the top arm decreases. The arms then return to their original position. Without draft control, the operator has to continually make these corrections by adjusting the 3pt arms.