Bob's right on the money there! It sounds like your drawbar (the tractor drawbar) is too low for this plow or how it is adjusted. A low hitch puts a lifting force on the rear bottom not letting it solidly into the ground. I'm guessing the plow crabs left into the land like the front bottom is trying to take a 20" bite. The furrow wheel might even gouge into the furrow face. Nothing rolls over nicely. It might occasionally find some sweet turning land & do fine but soon jumps back out of the ground crabbing left and makes a mess. Swinging your drawbar right does little to counter this even though the front plow no longer takes a full cut.
I'm not familiar with the 40C plow but it looks like MAYBE the front end of the rod between the left lever and the hitch assembly is threaded. If it is, try to adjust it longer to lower the hitch assembly on the front of the plow.
If you want to plow 7" deep, find a point 3.5" up from the rear plow's cutting edge that is 3.5" left of the lead plow's landslide. Then with it all hitched up visualize a line from this point to the point on the tractor where the front end of the drawbar attaches to the tractor. The entire hitch assembly should be in a straight line between these two points when plowing. Right through the clevis and everything. Adjust accordingly.
To adjust "mixed machines" (like maybe a Case plow to an Allis WC flat top or a JD A) I've set both the tractor and the plow's land wheels and the tractor fronts (tricycle) on 7" blocks with the plow lowered to plowing position all on a concrete slab just to stand back sighting across a framing square and set these lines up. It's a bother but it gets you close.
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