@OldSurferDude What is the distance between your Gateway and the backyard Node?
Also I'm experimenting with radio ranges. I wasn't really happy with the NRF range even when using a PA / LNA. The max I can get is a bit over 20 meters. That is without repeaters.
I've created an RFM69 gateway with a Nano and added it as a second gateway to Domoticz. On that gateway I soldered a DIY antenna - not a long range - and that one has a range of over 70 meters. Measured with the GW inside an my battery powered test node was outside.
For my test I just created a simple node that echo's the state of a binary sensor that I toggle each 5 seconds. I have two leds when for the sending and one for the receiving, so I could see where the border of my range is.
So for my outside nodes I'm in the progress of replacing all the NRFs with RFM radios.
Also when you change the caps to 100uf you should have a longer range and a more reliable network. But adding repeaters does help in extending the range.