I don't have problems with imps really, they do indeed take a while to kill but I just spam RoF, FnB and breath away. :P Not stopping, perhaps popping a heal or shield or both.
Also be sure to use FnB Immolate as it makes your RoF 50% more effective against those little shits.
What seriously kills me is the felhunter second phase, sometimes even the first.
Also a major annoyance is that annoying imp, they could have done without that because that is just uncalled for. It's hard enough.
Fucking imp completely ruins some of my attempts.
---------- Post added 2013-04-16 at 09:13 PM ----------
How do you re-enslave?
Seriously I found out my enslave simply runs out, it wasn't the felhunters.
Re-enslave doesn't work it seems, I can't cast it again until it runs out.