That's actually terrible advice if you're using it to level mules like you said. You only get xp for 8 mobs a pop, so if you one shot 20 of them, you wasted 12 mobs. Yeah, you get chests from them...but you'd get more xp if you cleaved them without your 2h. You're talking the difference at capped xp (600) between 4800+page+boxes a pull and 8000-12000+page+boxes a pull.

Try using 1-2 PDT atmas and RR, or if you have enough WHM support, use RR/GH/SS