I have 84 hours in the game and I have also watched hours of footage. I know how to hide at this point!

There is a reason that Nautiloid Tanks are used in the test I suggested to replicate the issue. This is because Cambion AI is currently not set to break objects or jump/fly past a blockage in the terrain, allowing a player to focus on hitting the cambions without getting hit back.

For an example, see this image I grabbed off of Reddit: https://i.redd.it/t9xne39bj9t51.png

Credit goes to u/Leslawangelo from Reddit for the image.