So you changed your hardware, but you are afraid to change the firmware to match your new hardware setup, and now you are abusing a feature in Cura to compensate for your printer being misconfigured, and you are surprised that the visualisation of what you are doing is wrong?
You could put an M221 command in your start gcode. That way Cura doesn't really know or care that you want your flow rate at a strange value. But you should really fix your firmware to match your hardware.
Could it be the Flow Rate Compensation Factor, because im not quite sure what it means
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