Specier I have two Rally derailleurs. They look just like the two in your first picture. The angle of the cage is different - just like yours.
On the one that looks like yours on the left I:
1. Rotating the cage away from the stop, removed the stop screw 812/1A, and let the cage completely unwind, clockwise viewed from the front, pushing the parallelogram out of the way as it unwinds.
2. Removed cage by removing bolt 811/A.
3. Re-assembled it, with the spring in the top hole, when viewed from the back in your second picture on the right. Mine was in the lower hole to begin with.
4. Wound the cage about 1/2 turn counter clockwise, viewed from the front, and installed the stop screw as soon as it cleared the stop.
Now it looks like yours in your first picture on the right.
Hope this somehow helps.
Looking at my spring cover from the back, the spring is in the lower hole - when oriented as in your second picture on he right. The holes in my spring cover are oriented the same as yours in relation to the stop screw as show in the first picture of your second post.
Changing which hole the spring is in, in the cage, changes the angle of the cage approximately 45 degrees, in relation to the stop.
Changing which hole the spring is in, in the spring cover, changes the cage spring tension.