I forget (and I frankly don't have the interest at this point to go back and re-read this humungous thread): did you want this connector to switch something in your circuit?
Because if not, then just forget about the "shunt" connector and connect your negative terminal to the sleeve.
If you want something to be disconnected, then use the "shunt" connector as a switch (normally-closed).
Regarding the connector terminals, what you got there, good buddy, are good old solder terminals. Time to fire up your soldering iron. Crimping ain't gonna do it. (You may use that crimp-able tab on the plug sleeve to wrap around the cable to secure it, but you definitely need to solder the wires to the terminals.)