The Coin gear makes for great filler. Even just getting the green helps, as all the parts have + Enmity. Just stack Black/HP, and use provoking Roar stigma. I keep incite rage for emergency use.
Since 2.1 only the uber groups have given a difficult time with keeping agro.
Also mace/shield keeps better agro in my opinion. You attack faster then GS, blocking generates agro, and your shield agro attack. I only switch to GS if the agro is on someone else (shield is useless if your not being hit).