I'm kinda surpised to see that these older straight parallelogram Simplex RDs are also tensioned at the top pivot with a spring. Maybe because I never owned one of these model Simplex's. I always thought that they are only tensioned on the bottom pivot to control the jocky wheel cage movements (like the Campy NR RD). If this does indeed require upper pivot tension, It most likely needs to be pre-tensioned (twisted) before bolting on to a dropout. That might be why things don't seem to be lining up on you.

Chombi