There is no hardmode for Hammer Station. We being running Black Talon HM for days now, farming gear drops to prep for operations. There is a tight enrage timer on Commander G but you can kite him as a tank after he enrages.
There is also a tight enrage timer on the bonus droid boss but you can los him behind a pillar.
For the last boss (bubblegum), her enrage timer is short too and so far we have not found a way get around the enrage timer.