LoRa P2P - Best RF settings

Hi, I am working in a system to be used in places with houses, buildings, underground areas and walls on the way. The communication distance between nodes are not big, max 150 to 200m.

My payload is variable, between 40 bytes to 180 bytes.
Currently using this settings (country Brazil): “915000000:9:0:0:8:20”

I have a custom board with the module RAK3172 in AT mode, with a host controller. The Software is almost ready and I wonder if the RF settings above are the best for my application.

Frequency and TX Power are clear, but the other parameters are tricky!
Please, is there a tutorial or sequence of tests to determine the best settings?

Thank you.

Maybe this blog The Best LoRa Settings for Range and Reliability helps.

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