For steel with a copper electrode, start with these parameters:

Proper flushing determines the success of die-sinking EDM. Without clean dielectric fluid flowing through the spark gap, localized heat will build up, causing damage to both the electrode and the workpiece.

I was unable to find a specific academic or technical paper directly titled or focused solely on the

Maintain moderate pressure. Excessively high pressure can deflect thin electrodes, while insufficient pressure causes debris accumulation.