How do I change the "Share Ground Conductor" setting for Wires?

[jordenXTK9V]

I have an issue where Revit is combining the ground conductors when there are multiple runs of wire. 

For example, in this screenshot Revit correctly calculates that (3) ground conductors are needed in the "Ground Conductors" property. However the "Wire Size" property has combined those (3) grounds into (1) ground. It has also combined the neutrals:

I imagine there are cases where this is desirable behavior, but in this case I need to tell Revit not to combine the grounds and neutrals.

I've searched the circuit settings, wire settings, panel settings, distribution system settings, wiring types settings, but I haven't found what I need. The closest thing I've found so far is that when setting up a Wiring Tag Label, one of the parameters available to put in Wiring Tags is called "Share Ground Conductor": 

This sounds like exactly the setting I'm looking for. When I apply that label to the wire, it shows the value of "Share Ground Conductor" is YES, so it's possible that this setting governs the behavior I want to change.

Does anyone know if "Share Ground Conductor" is the setting I'm looking for? If so, do you know how to change it?

In case it's helpful, here are my distribution system and wiring type settings that are being used in this case: 

[jonathanJC32L]

I think the parameter you're looking for is actually a Family parameter of Wires: