adjustment of disk

[spo307]

the middle of the rear gangs are deeper than the outside is this do to the wear, adjustment of the springs or a combo of both, springs are shot and will be replaced, as will the disks

 

[MMagis]

Tough to tell, but my GUESS would be the springs are the main culprit.

 

[Don87]

I've never used a set of discs, but on the video at 'Everythingattachments.com', their brand new one did the same thing on freshly plowed ground. After several passes, everything leveled out and cut evenly though.
Hope this helps