Very nice and congratz so far
Tal mask, Hone Sundan (with shael + random rune + random rune) together with Treachery in any 3 socketed non-eth armor for your merc. Gives your merc a sick IAS bp and some nice life leach, red dmg, resistance, fhr etc.
Wear Treachery and let it procc for yourself and then give it to your merc merc. If you can stand doing this it'll help you out a lot.
Countess will be your friend aswell
GL!