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I'm not really sure why Crushing Vines , Ray of Revelation , Pithing Needle and Naturalize are mainboard, they're much more of a sideboard card than mainboard as they would be near useless if your opponent isn't running artifacts/enchantments. A normal human or zombie aggro won't be bothered by them as they generally are creature heavy rape your face with damage decks. Also this is post scars, not sure why so much artifact disruption is needed in a block with few artifacts. Getting rid of those 5 will free up a lot of room for more stall on aggro decks, such as putting in a few Fiend Hunter s, since they not only help you, stop aggro, provide a nice chump blocker but they also help with Angelic Overseer
Plummet would work for flying killing, plus 1 less mana. You don't have to kill the fiend hunters... but in the aggro sense, they will slow down your opponent. If they have to spend a whole turn getting their creature back, then it's well worth it since you stalled them a full turn.
I agree, that is a ton of Artifact hate. You already have so much artifact hate in your side-board as well, I think you could stand to lose some in your main deck. I also think you should drop red and maybe add in some enchantments that will keep your early monsters alive. Maybe add some human tokens to keep you protected early game.