In same spot...hardest boss fight for me recently was the two gargoyles down in the Neocron or whatever it's called. took me quite a few tries even with mimic tear ashes. Finally had a round where neither one used much poison.
The two gargoyles tore me up this morning. I could almost kill the first by the time the second showed up, but my spirit summons wouldn’t distract the second one.
I’m in sage robes, so they pretty much two-shot me. The crucible knights there weren’t much of a problem though. Two combos from the fang kills them pretty easily.