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I seem to have circumvented the problem with an EMS script which uses a Temperature Setpoint actuator at the node immediately following the pre-cooling coil and simply hard-sets it to a constant 12.7C.

I'm pretty new to EMS so please feel free to comment if you think there is a better or more elegant way to accomplish this within DB.

EnergyManagementSystem:Actuator,
   PreCoolCoilSAT,
   CLG COIL AIR OUTLET NODE,
   System Node Setpoint,
   Temperature Setpoint;

EnergyManagementSystem:ProgramCallingManager,
   ScheduleAvail Manager,
   InsideHVACSystemIterationLoop,
    PreCoolCoilSATPrgm;

EnergyManagementSystem:Program,
    PreCoolCoilSATPrgm,
set PreCoolCoilSAT = 12.7;