you could also use light light earth with a more health oriented equipment, since the regen is based on maximum health and majority of your damage taken in the pull is physical, you can cap physical and get a larger health pool to work with
That sounds solid, I'll try that out next run.
Also when it comes to clearing a fetter and actually killing all the surrounding voltes, what we usually do is have the PUP deploy onto one of the Su5 Voltes (the stronger ones). This will link a pack of 4 voltes onto the Automaton, then our main tank will pull mobs individually and pull them to the group.
This is particularly useful for certain fetters where the 8 voltes are too close together and usually pulling 1 ends up pulling all 8. The automaton can tank 8 volte mobs without any issue, it's only when the disjoined joins in which is worth worrying about.