Also, looking at the first picture you posted, see that crown nut that is on a bolt coming up thru the draw bar your 3pt links fasten to with the crown nut on top??? Remove that bolt and slide the drawbar toward the left side of the picture. There is an exposed bolt hole in the drawbar to the right of that crown nut about 3 inches, replace the bolt using that hole. Then see if your 3pt arms aren't better centered with the plow top link bracket.
Not sure why the previous owner had the drawbar pushed that far to the right. Probably trying to get the plow to work without changing his tractor wheel setting. Or might have been using it on a tractor that does not have adjustable rear wheels. When you get this setup right, the plow will naturally follow straight behind the tractor with the 3pt arms and top link pulling straight off the tractor.
Some plows have a fine adjustment that can be made on the drawbar but this appears to not have that luxury. A fine adjustment can get the plow set to take it's maximum amount of cut with the lead plow.
Your plow also has an adjustment on the right side (in the photo) of the drawbar to set the direction of the plow in comparison to the direction of the tractor. This also appears to be set to one extreme. It has the plow trying to run toward the furrow. When you move the drawbar to center the arms, you may also have to adjust the direction the plow is headed in relationship to the tractor. If the plow keeps trying to go toward the furrow, loosen the forward bolt and tighten the rearward bolt to turn the plow away from the furrow. Of course do the opposite if it goes the opposite direction.
When you have these adjustments made correctly, the plow will pull centered with the tractor and take it's full capacity cut with the lead plow without the sway bars on your arms pinned.
Speaking of sway bars, it doesn't appear that you have the ability to pin your sway bars in a slotted position that allows limited movement?? You need that if it's possible. The sway bars should not be what is holding the plow in a certain position in relation to the tractor. On older tractors they used chains and the chains were only set to keep the arms from swinging into the tires when carrying the plow. Once the tractor/plow is set properly and plowing, the chains hung loose and did nothing.
A properly adjusted plow is a work of art. A plow out of adjustment is a disaster. A lot of "city" farmers give up before they get to the artistic part.