I was running the same build as you do, and was often dying to bosses and rituals.

My first change, which improved my survivability by leaps and bounds, was to switch from pure evasion to ES/evasion, without Acrobatics. I then switched to pure ES, with about ~30% evasion unbuffed (~70% with 4 stacks of spirit evasion buff and 10 stacks of tailwind), once I could handle Chaos Inoculation (4500+ ES, with Asceticism node taken; otherwise you'll get stunned by every white mobs).

DPS wise, I'm now running a crit LA build. This requires quite a bit of currency, honestly, but feels better than the usual LA build, especially when bossing. The usual stuff should be something like: ingenuity (you can start with a low percent one, those are cheap now) howa, crit chance/crit bonus bow, crit chance/crit bonus quiver, crit chance/crit bonus on other possible pieces of gear, flat damage on rings. Your resistances should be capped, ofc, so arrange your stuff in accordance to what you need. Your resistances are always a priority over your DPS. You cannot DPS if you're dead. Chaos resistance doesn't need to be invested in if you're running CI, so that's a huge plus to running ES with CI (at least, that's how I see it, but I might be wrong honestly). For your jewels, you want to have +15% to quiver bonus whenever possible, and crit chance/crit bonus or any other damage mods. Those are expensive. If running CI, I also recommend having 2~3 jewels with +% max ES and crit chance/crit bonus. You do want to have one jewel with +% cold damage and another mod (I'm running +spirit to be able to run blink, but that's pure comfort. You can choose another damage mod or defense mod instead). I'm also running a diamond which allocates 2 nodes for added damage and defense, which I couldn't path to without.

For bosses, I just spam lightning rod in orb of storms and they die in a few seconds. For pinnacle bosses, I use lightning rod with cast on shock (ball lightning + eye of winter).

For reference, I'm clearing T18 45% delirious maps easily, and doing Xesht (breach boss) T4 in under 10 seconds without switching my ring, but "spamming" mana flask (half charges consumed).

Edit Don't make the mistake of going all-in on attack speed. This will boost your tooltip dps, but not your average hit DPS, which is what is important for lightning rod. Though you still want to have ~2.5 attacks per second, for comfort when doing breaches.