First thing, only work on one thing at a time, working from one end to the other. Make sure everything is right before moving on.
With Ems there is often a knock on effect, which will make you look in the wrong place, fixing symptoms and not the cause.
Schematic are drawn reset and with the game ready to play ball one and the power off.
So we need, credit on the credit reel, close the zero SW, we need the GO RE tripped to close the SW on the GO RE, we also need the score motor in the zero position to close the Scr Motor SW.
Remember that the coin door has a Jones plug. Now check that we are energising the Credit Unit reset coil.
Once this is confirmed we can move on.
Now you have Steve on-board, problem almost solved - Morning Steve (For me).
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PS, I think most of your issue are related to the GO RE, will see as we move along.