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Reply to "thermostat"

 I’m confused.

 Can you post photographs, please ?

 Here are some terms that are important to any discussion on thermostats:

High flow vs. regular flow thermostat 

     Perhaps this is what you are referencing with your term “orifice” ?

Brass engine block restrictor plate 

      Or is this what you are referring to as an “orifice” ?

thermostat “piston “ “hat”

       This is not designed to totally block coolant flow when it fully expands in to the restrictor plate. 

Rated opening temperature 

        IMHO,  your 160° Is too low