If you havent already. You should cycle through the mobs with your skills. For example, you have three mobs. Shield lob > Flash > Fast blade target #1. Than switch to #2, use Savage blade, And than switch to target #3 and use Rage of Halone. After all that do another flash. repeat the processs but b4 that, make sure you use fast blade on the current mob (in this case #3) so that the next one (#1) will get the enmity generation from savage blade.. I did this pre-shield oath and held aggro just fine.

Target #1 > SHield lob > Flash > Fast blade > Target #2 > Savage blade > Target #3 > Rage of Halone > Flash > fast blade > Target #1 > Savage blade. so on so forth.