Monk - feeling (very) squishy in t14's and 15's, what can i do/change?

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More evasion rating and swap two ascendancy points to the node which gives armor per evasion
I would grab Spectral Ward and consider swapping to full evasion (2100+) chest, swap to full ES helmet and grab Subterfuge Mask, then run Grim Feast for mapping. Keep acrobatics as it is just so OP right now.
I ran “Protect me from harm” for about a hundred maps but it did not feel nearly as good as just grabbing more ES + Grim Feast.
Take ES/ evasion hybrid nodes, your eHP is bad, and your evasion is low. You passed by two great hybrid branches. Also you missed 2 passive points from the campaign.
Unspec some damage, and take hybrid branches, they're not optional if you going ES route imo. It's not like you get a ton of flat ES from the items, it's actually the increases in the tree, which are dramatically overtuned and you took none.
With enough ES you will be able to tank any slam while mapping.
I would also add look for an amulet with a base type that's useful for you. Your ascendency makes the spirit useless the other affixes are good but don't overlook a nice implicit.
Really just invest in the eva/es nodes in the start and get the es for evasion on body node, and go get the obscene 60% increased es with the 25 int node up by ci (you want the 25 int for howa anyways) that will put you at 3k es before grim feast which will feel great.
I stack ES heavily on my build, taking inner faith, spectral ward, and patient barrier. I have 4.9k ES and am able to farm t15-t18 breach. I have no trouble with survival unless I take 2+ map mods that increase my damage taken.
Your chaos res is so low that you might as well take CI as well.
I’m only lvl 30 and just swapped from gas cloud bows to ice strike charged staff and it’s awful how much worse I do
ES for body armor evasion node is the easiest you’ll gain evasion and probably 1000 ES along the way. Then make sure to use ghost shroud and have some form of on kill or hit recovery.
If you are playing hybrid evasion/ES, the "gain body armor evasion as es" and "gain helmet es as evasion" wheels are both 1000% mandatory.
They're not just good - they're pretty much singlehandedly enabling that defensive setup.
Your Evasion is way too low for acrobatics. I think taking acrobatics at about 15k Evasion is the bare minimum, and it should really be higher.
My ev/es gas arrow pathfinder was at 73% chance to evade and 1100es when hitting t10 maps, for instance.
I think your gear is mostly fine (though you need more life). Your tree is the problem. You really need to take more defensive nodes, it's that simple. You've gone all out on offense while passing directly by some of the strongest defensive options in the game. If I were building an es/ev monk right now, I'd be taking all three ES/EV wheels in that area.
What are you using your spirit for?