Reply to "To Remove the Proportioning Valve or Not to Remove the Proportioning Valve? That is my question…"

 Proportioning valve was designed for a stock car. You no longer have such a critter so remove it. If it is still working it is not working in harmony with your current configuration. 

 Keep the shuttle valve after a thorough cleaning. It is still a somewhat effective safety device. 

 As for the aftermarket proportioning valve I will defer to others wiser than me. 

Larry 

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