I remember at that lvl I would shield lob pull, flash, flash again, then go into my Halone combo, as said not on just one mob, spread out. SO on mob one I wold do Fast blade > Savage blade, switch to mob two, Rage of Halone. Go to mob three and repeat as if mob one, then same to mob four. Flash as neccesary.

Instead of the second flash you could go into your Halone combo on the one mob then spread it out among the other mobs. I like the two flashes because the first will add hate and blind and the second just adds a lil more hate, and possibly blind on a mob that may have resisted. At times the best use of flash is every time blind wears. So when you see it wear, use it. If it's in the middle of a combo it's ok, it won't break it. The less you get hit, the more hate you keep.

Hope it helps

Syn