1. Use the connector in the middle of the board.
2. Mine doesn't have the Ferrite core as well. I'm not sure how much it help but it will work without it.
3. yep, that's white manuals are for.
4. The bend on the switch is normal. Sometimes this needs to be bent to make sure the head is in the middle of the print area. Sometimes the head will hit one side of the machine, so you bend that tag to make it move away from the edge.