Giving my R9 system one last try with Slim+ receiver but was utterly disappointed. As you will see in the FPV video feed, Rssi fell to only 30s after I made the turn back despite having vertically mounted antenna. Have since decided to go XF.
On the return flight, decided to fly closer to a block of apartments. Loss track of precisely where I was standing and did not realize that I was flying into a dead zone for the 5.8ghz video, blocked by two buildings.
Tried to maintain a steady hover for a bit before switching to angle mode to keep it in the air. Thankfully the video feed came back and I was able to fly it back safely.