2 skill lvls barely helps out ww sins. Poison damage is the whole reason why the character is good in the first place. Since have horrible physical damage, and thats what your 2 skills is assisting. So your getting extra %'s on something that is small anyway. It won't help much.
I have max resists easily without a single resist charm, so no point in that, and that includes my 5/-5 shako. The um shako is only if you really don't have the resists.
Of course you can use whatever you want, but as I mentioned in my guide, COH and enigma are both far worse armors then Bramble or Nats, and they are also equally or even more expensive.
Whats the point of using an armor thats not only worse, but more expensive?
About the mara's, yes you have to stat your character without your mara's on, because it has 5 stat points that you won't have when using angelics.
And its impossible to beat ww barbs and smiters or zealots without angelics. The best AR you can get without angelics is around 10K or less. Thats not enough. You need 15K at least, and 20K is ideal.