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As a final update, I completed the project by:
1) Deleting the stupid W pipe at the OEM pump inlet
2) Running 38mm tubing from the EWP to the OEM pump inlet
3) Running 38mm to 35mm tubing from a Davies Craig DC-8315 prior to the EWP, to the radiator. This allows there to be a return line for the coolant reservoir and heater core.
4) I deleted the metal heater core return line
5) I used red and blue silicone 3/4" tubing, a brass T line, a brass 3/4" connector, and a 3/4" silicone elbow, to connect the reservoir and heater core
This returned the flow of both of those lines to the correct location, which is before the pump. This also removes the stupid OEM U line which captures bubbles. Everything works perfectly.
