I don't know about saving it from session to session.

But what I do is Character Config -> Ground Targeting Settings->Unlocked
The default setting for that, at least for me, is just a little above me. So it's perfect.
If I need to adjust the default setting (for the session) I use R1+L. I don't use that for moving it during battle though, because it's inconvenient as it stays there for the next time it's used. Instead I use camera manipulation (as if it weren't unlocked) to do so. So it's a mix of both versions and IMO much more fluid.

So to summarize:
* Use unlocked to set a default place for your session
* Use camera manipulation for easier adjustment.
* Never turn the game off

It would be nice if it was saved from session to session