Ford MC with separate 2psi RPV’s
OEM proportioning valve removed
Shuttle valve operational 
Vented Mustang rotors all 4 corners
Wilwood SuperLite II all 4 corners 
335x35/17” and 245x45/16”
I think it is time to add an adjustable proportioning valve on the rear circuit. I believe that valve should be located after the shuttle valve and am seeking your collective wisdom for confirmation or rebuttal. 
If installed before the shuttle valve I believe that would create a front /rear pressure difference within the shuttle valve and likely shift that valve’s internal piston. 

Sent from me using a magic, handheld electronic gizmo. 
Original Post

After thinking it through, putting the proportioning valve after the shuttle valve should not cause the warning light to come on.  The shuttle valve would get full pressure from the MC, and the rear brakes would get reduced pressure.

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