Help with crafting strategies for mid-late game armor in SSF / Atlas strategies to help crafting

First time SSF, I'm playing Jung's Locus Power Siphon miner. Just hit red maps and it's going really well with only 22H /played, but I'm looking to learn how to make some really solid gear for my character, namely a really good wand, a high evasion/ES chest with suppress ideally and just general good gear. Here's my current character for reference: https://pobb.in/TVaP4DQ9MhPz . Also looking for some atlas tips as currently I've saved my 2nd and 3rd trees for once I understand better what I need to grind and farm before I try to make trees for that. My current atlas tree is just all map nodes, 60+% for expedition, Jun, and harvest, as well as some Destructive play and other Conq/Elder map drop chance.

For the wand, I assume it's mostly just spam essences of Wrath and try to get one with Essence lightning + spell damage, another flat damage roll and crit multi. I think that's straight forward but essence grinding is feeling pretty slow atm, maybe it's best to farm them in yellow maps fast? Unfortunately costs 6c for the map device option and I don't have a ton of currency saved. My DPS is pretty decent so far, not sure if my PoB is configured correctly but the Mini atlas bosses died pretty fast and we'll see how the quest version of Eater/exarch go shortly.

Pretty lost on how to craft the chest, and IMO it seems like the most important defensive piece of the build. I've tried some defence reforging on Harvest, and it seems okay and like I could maybe get some good results if I had higher quantity of juice but with no eldritch currency and no annuls, feels pretty hard to get really good chest piece. Any suggestions here would be amazing :)

Thanks in advance for all the advice, having tons of fun getting into SSF even though I'm a little boosted by the boosted drops from Necro settlers.

EDIT: Side question, is there a special area that drops Necrotic armours? Or is it just only from T16 maps since it's a level 84 req item?