I have downloaded and run your case with the Design Study tool and I have encountered the exact same problem. I simply couldn't solve it using the Design Study, so instead, I run it through our own Solidworks Add-in, CORTIME.
If I understand correctly your problem (feel free to correct me if I don't) you want to minimize the angular displacement of the red bar while fulfilling Grashof's condition. For that to happen, I changed two things from your original set up:
First, I changed the ranges you were working with. I run the design through our Built checker, and it had problems rebuilding at some of the points.
With the new ranges, as you can see by the green light, the model rebuilds at any point.
The second change was done to the goals, since I assumed your goal was to make the angular displacement smaller I tried to minimize the Maximum value of the ang. displacement and maximize the Minimum value.
This is the resultant graph obtained. The angular displacement went down to a total of 16 degrees.
As you can see in the last attached picture, I used the same constraints as you did in order to fulfill all the Grashof requirements.
Let me know if this was what you were looking for.
This is great. What a coincidence that you replied. I am actually familiar with CORETIME, as I spoke with your team at SOLIDWORKS world this past February, any chance that you provide trial licenses so I could try this for myself?
Alexander, this problem is known and has been reported as SPR 614207.
To request a fix and be notified of the evolution of the status of this SPR, please search for SPR 614207 in the SOLIDWORKS Knowledge Base (KB) and select 'notify me'.
At the current time, you can multiply the values you see in the table of results by PI/180 to get the correct value in degrees.