Any good barb has more run/walk then you can slow them.
Also deceprivy has a really short time span, 15 seconds at level 20, this wont be close to enough time to kill a good barb.

What are you talking about... Lower Resistance pierces resistances.... it just doesn't show the change past 75% resistance. Test it once in awhile You'll notice a damage difference in someone at 75% res and someone at 75% res who is lower resisted.