Im Still using EotE and UF with Ilvl 498. But i have the 4piece boni and so it make's it better than PE + EM. Glyph's are just like i say , Glyphed Capacitor Totem, Glyphed SR to dispell the Stun and FS Dot Glyph. My tactic is really simple.
After the third stun from the boss (Might be at ~45%) i use my second pot, use Fire Elemental, use Hero and got him as fast as possible under 30%. Under 30% is use the Feral Spirits, Ascendance and Stormlash totem and move as hell by doing dps as hell. A little luck will help, i have several low % hp wipes.
Best wipe was it when i got the boss at 12k HP left and he portet me out of the arena, that was so much pain. Same at 400k left and other similiar "wipes".