You don't run two wires from OEM relay to trigger the solenoid at starter and ford relay.

One trigger wire from OEM mopar relay to ford relay. Or put a newer relay in the line and attach NSS to it. No more OEM relay... Had to do this on a friends car because of the way it was wired.

The starter gets a jumper from main stud to solenoid stud if it has one. It's only hot when the relay at rear is fired through the main cable.