I tried out tilting the rear gangs downward on my bigger disk this weekend. The angle of tilt was great, but the tongue on the disk is spring loaded causing the front gangs to level out as soon as pressure is put on the rear gangs. Looks like tilting will not work for me because of that. That was on a ~14' old case with the wings cut off.
I have a 7' drawbar pulled really old deere disk I may take the front right and rear left gangs off of making the two remaining gangs cup to the same direction and see how that goes. Taking those gangs off isn't a major job so it doesn't hurt to try. If that doesn't work I will finish the fab work on the old 6' 3pt disk to remove the front gangs and place a longer bar to space out the rear gangs.
Assuming I can get the roads dry enough for major machinery access, a road grader would certainly be the way to go. But I don't know anyone nearby who will hire one out and don't think anyone in their right mind would subject their machinery to all the mud and branches that would beat up their machine pretty bad. The picture I shared is a pretty tame location. That and we have too many projects for this summer and hiring a road grader is at the bottom of the budget list.