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Sorry, I don't understand what you are doing here, please explain. How can an additional wire increase resistance?

My general thoughts about VFD tripping RCD: RCD is usually not sensitive to high frequent currents. Motor cable should always include a low inductance earth connection between motor chassis and VFD earth ground, preferably use a shielded cable with respective EMC cable glands at both ends. This way PWM frequent VFD output can't spread into mains power supply.

Most common RCD problem with VFD is combination of too sensitive RCD with large Y capacitors.