@Bond This can be frustrating, just some comments
Does the python code still work? If it does (or even partially) this would give you some clues. I notice in the python code there is a setting for connection to an MQTT broker, if this code works you could setup a broker in Node Red and communicate through MQTT using the working python code.
The python code uses the minimalmodbus python library and only sets the baud rate so the remaining serial settings should be default based on the minimalmodbus docs which is 8N1 so in the modbus config you should try serial expert and set the config to 8 data bits none parity and 1 stop bit.
I used a modbus scanner to initially get the communications working and then scanned the likely registers to read some parameters. This enabled me to fault find towards a solution. The scanner is here
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