Honestly....., from those pictures, it's difficult to see why you'd be having any troubles. Plow looks fairly level front to rear/side to side. I'm a little curious about the width of cut on the front bottom. Looks like offset drawbar is a bit far to the furrow side. That would cause front bottom to cut a wider slice and give the appearance of moving more dirt even though it was at the same depth. Other than that, looks like you're in the ballpark on other settings.
I noticed the gap under the rear share. I was wondering how level the gravel is under it???? Looks like the rear landslide is parallel with the ground like it should be. Maybe try to extend top link a bit more ????? Too far and the plow will want to ride up out of the ground.
Plow too deep, and the tractor's tires ride in a furrow that's too deep, causing the tractor (and attached plow) to sit out of level, low on the right side. That might make the front (right) bottom sit slightly lower.....just a guess..... Try plowing at 6" to 7" deep and see what takes place.
If at all possible take yet one more photo directly from the LEFT side, 90degrees to the tractor/plow and far enough back to include BOTH in the photo. Pictures can be deceiving....looks like the tail end of the plow MIGHT still be a tick high, which would explain everything.
When I have my MF66 plow hooked to the 150, and it's adjusted correctly, it appears as if the plow is way LOW in the tail end when raised. It runs level in the ground though.
One last wild guess....How much slack is there in all the linkage? Once a plow is in the ground, the top link will be in compression. With a little slack here and some more there, it's not impossible for the cumulative effect to add up to enough so the plow raises a couple inches or more in the rear.