1) I don't know much about valves, so I'll let someone else answer that one. Never really had problem with any.
2) My bad, it was part #52.
Tweaking the leaf spring is asking for trouble if you don't know what you're doing. Every time you bend it you make it less durable too, so you want to play with it as little as possible. If the pistol goes full auto it means the arm on the leaf spring that resets the hammer sear is not doing its job. You probably bent it too much.
I'd say you are getting there, you are encountering all the most common Hi-Capa/1911 problems. After that you'll know your way around a Hi-Capa. You can never get good if you don't fix problems. I learned all this fixing WE Hi-Capas. ;)