Pooh_Bear said:
Shorten the top link to go deeper.
Lengthen the top link to go shallower.
Pooh Bear
Not entirely accurate.... Putting a plow "nose down" will make it dig in QUICKER, but a plow needs to run ALMOST level to turn the dirt right. Too much down turned angle will make a plow "porpoise". It digs in too far, then draft control or position control (depending on what your tractor employs to maintain plow depth) brings it back to normal pre-set depth, then it tries to dig deep again, over and over. You end up with a rough plow job, working your tractor MUCH harder than needed, and a stressed out/worn out operator. Adjust the top link out too far and you can't get the plow in the ground in the first place. The entire "range" of adjustment in the top link (screw in or out) should be less than 1 full turn from level.
GOOD, un-worn shares make a plow go deeper with no unorthodox adjustments required.
A plow needs to be level "side to side" as well as "front to rear" to do a good looking job. If you have to go outside those parameters to get a plow to cut, you have other issues.
To the original poster, what sort of ground speed are you plowing at? Too slow will among other things, not break up the dirt as it flips. MOst plow bottoms designed and built in the last 50 years or so need at a MINIMUM, 4 mph. (on up to 5 or 5-1/2MPH) Too fast tends to flip it too far. (More than 180*) Too deep won't turn at all, allowing the strip of plowed dirt tends to roll back "face up" into the plowed furrow. Too shallow is worthless and a waste of fuel at best.
For a "smooth" look after plowing, you want a smaller plow. (i.e. 12") A 16" plow will leave the plowed surface a bit rougher in most cases. (unless soil conditions are near perfect)
Plows are INTENDED to be used at a depth of 1/2 their width, + or - 1" (i.e. a 16" plow should be used at a depth of 7" to 9" with 8" yielding the BEST results)