After much experimenting I found that I like my original Hydra (not 8) best on a German Copulare rack, the Hydra directly on top of Aurios Pros and the rack itself on Aurios Pros.
For a while I thought that I like the Hydra on Stillpoints but then it seemed that dynamics had vanished (I have yet to find a case where I prefer the Stillpoints to the Aurios).
For a while I thought that I like the Hydra on Stillpoints but then it seemed that dynamics had vanished (I have yet to find a case where I prefer the Stillpoints to the Aurios).