Regen from the Automaton is only activated by The level difference between the mob and its current target.
Example: 75PUP and 65DNC vs Lesser Colibri, We were just messing around having a little fun.
Sometimes she would run up and smack the mob first, having hate, I deploy before I engage, so the auto would Flash > (The mob would still be facing her at this time) and he would Regen her. Due to not needing a Cure from HP being too low. I never receieved a Regen, due to my level being too high and it not caring.
When this requirement is met, he prioritizes Regen over Enfeebling, but not before Cure. and of course, -na spells are the most important.
For whatever reason.
FU S.E.!
>.>
Hope I helped at least a little.