Having approached this problem as a total novice recently, and experiencing some of the same problems, all I can tell you is to play with it. The two things that seem to make the most difference to me are 1) top link length and 2) side to side spacing of the plow.
For the top link, it needs to be adjusted so that the front and back moldboards engage the ground at the same 'time'. If it is too short, the front will engage a lot, and the rear less. If it is too long, just the opposite.
But even that is modified by the side-to-side adjustment. That has to be made so that when one side of the tractor is in a furrow made by the previous pass, both boards are engaging at the same height and angle.
You can also make some adjustment in the lift arm height.
Again, I'm a total noob at this and probably not explaining it right. I just futzed around with it until it was right. But, when its right, you'll know it. Its a beautiful thing!
If possible, take some pics and let us see what is going on.