OK, I’m just going to make this quick.
A big shout-out to Michael99645 for taking the time to help me better understand LoRaWAN and providing the fix for the GPS issue. Without his assistance, I probably wouldn’t have pursued fixing the downlink issue from The Things Network, as the existing setup was sufficient to complete my project. Now, all my original issues have been resolved.
Further testing by 180 students at the upcoming AgTech events in Orange, Wagga Wagga, and Armidale should provide a thorough stress test for this setup—and turn my hair a little greyer.
I’ll attach my working global_conf.json.sx1250.AU915 for everyone to enjoy. 
global_conf.json.sx1250.AU915.zip (1.4 KB)
Over the next month, I’ll do a more detailed walkthrough, as this will be needed for the students if they want to create their own LoRaWAN gateway.
Thank you everyone!!!
Kind regards,
Pete Smith
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