I should at least preface this by saying that every damage stat you roll is completely intended to buff Rain of Vengeance ONLY - if the stat does not buff RoV in some way, shape or form - and is a damage stat, it needs to be rolled to a defensive stat.
I think this is the important info that I was missing before. All of the stuff I read about Natalya seem to be focusing on CDR and how to get as much of it possible, so my primary mission was to increase CDR, apparently at the cost of other things that are more important.
I wish armory would update quickly, but since it wouldn't do that, my follow up questions would have to use the old fashion method. I'll focus on stuff that I have changed since yesterday.
Chest: You are missing 15% RoV damage, overall this is a bad chest piece the way it is rolled and there isn't much you can do to fix it. Replace asap - you want Dex, Vit or Resist all, 15% RoV
I got a new chest piece this morning. Non ancient, but the stats are:
480 Dex/465 Vit/RoV 14%
From your description, it seems like I should replace my current chest piece which has:
643 Dex/648 Vit (rolled)/Hatred Regen 1.38
Is that correct?
Pants: Good thing you haven't rerolled yet! These are a good roll for your pants, change Evasive Fire to armor or Regen. Ideally you want a Resist all but you can't roll that since you have a secondary resist.
Got a new ancient pants with:
633 Dex, 626 Vit, 120 all resist (rolled)
This follows what you said exactly so it looks good, right?
The previous one is:
479 Dex/488 Vit/Evasive Fire 13% (which I rolled into armor last night)
Left Hand weapon: WHY do you not have a green gem in this??? Rest of stats look fine. You want CDR but not in place of a socket if that's your only option to roll off. In order of importance: Max WHITE damage (the range below Damage Per Second), RoV%, Dex, CDR
I switched the CDR into a socket. If I feel like I need the CDR later I could always use a Gift to create a socket.
Right hand weapon: Consider as a + stat only slot. RoV damage is calculated based on left hand, so you want (in order of importance): Socket w/130% CHD, Marked for Death, Dex, CDR, defensive stat (LPH/VIT/etc). If someone else is running a Calamity, you can use a Balefire and drop the defensive stat
I rolled the elemental damage on the Calamity to Vitality.
Gems: Taegook (damage + armor), BoTT (you use this), Swiftness (CDR)
I got the three gems in. This is the first time I've used Taeguk and keeping the stack isn't really as bad as I thought.
I actually completed a 38 last night, shortly after I made some of the changes above. I could feel how my survivability have increased and I didn't die as often. My CHC and CHD also increased significantly while my CDR only down from 46% to 40%, and I could feel the effect in RG as they went down much faster.
Anyway, I'll be doing more bounties for a better stats Shoulder, gambling for better belt (the other Crashing Rain I had is even worse at only 3200% RoV damage), and I guess farming more keys for Hellfire and keep an eye on amulet drops. Other than that we'll see how far I can push through this weekend.
Thanks for the help!
Edit: Here's my current Offense/Defense sheet. Looks much better than before.