Well, how about this..
Mavinas lack open slots. So, you gotta even think it in conjunction with merc set up.
For jewelaries, you may realized that the set doesn't have any life leech bonus which means you gotta find it from other sources. I put a 6/7 duel leech ring (Gamble a lot!). That gives 11% mana and 7% life leech which should be enough in hell with any type of zons unless you miss targets a lot. People might concern that 7% life leech is not enough, but come on, you're a zon who may not heavily depend on life leech. So, 7% life leech should not be a problem at all. For the other ring, of course, a raven to get a load of mana and CBF. For ammy, this requires a consideration of merc set up. If you have a reapers toll (right? that unique thresher that triggers decrepify whatever), your merc will trigger decrepify constantly and you don't need to put atmas scarab for amp dmg. So, in my case, I put highlord to get +1 skill, hefty amount of deadly strike, and lightning res. It works quite well. If you don't have a reaper's on your merc, put atmas especially if you're a multi zon. For boots, I put gorerider for additional source of increased dmg. I heard that war traveller works as well.
If you're aming for FA as a back up skill after your main skill such as Multi or Strafe, you may want to put at least 3-4 cold dmg charms (should be with higher cold dmg on them). I heard they help to last freezing duration, which could be significant in hell.