It’s https://corescope.wmcd.net.au/#/map with display->multi-byte support checked. There’s more info here https://github.com/Kpa-clawbot/CoreScope/issues/689 on how that works and what is/isn’t possible in the underlying firmware
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Have you used the Semtech Lora calculator? https://www.semtech.com/design-support/lora-calculator it's great for all the timings and comparing settings. Meshcore is preamble 16/crc on (narrow with the long preamble as currently in dev will be 32)