if you have the new expansion then you may want to use a single stack of repair bots instead and use Engineers in the open slot.
They can repair your droids twice and have the ability to summon two additional stacks of either guard driods or Repair droids.
This works out very well when you cast phantom on them because the additional stacks that are summoned from the phantom will stay around even after the phantom dies.
the down side is that some times you will get stacks of guard droids instead of the repair droids.
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