PvP questions -balancing offense and defense

I still feel like there are some things I’m simply not understanding about PvP. Either that or the gap I noticing is mostly skill based or micro decisions about when to fight and when to dodge or run etc

But I feel like I have a hard time balancing survival capabilities (defense) and damage

I play a few different classes in PvP but let’s use my DK as an example

I have a ton of different sets I run but for this example

Build 1: mechanical acuity and shattered fate. I do a ton of damage and get kills easily

Build 2: mechanical acuity, esoteric greaves, telvanni enforcer for stamina recovery to offset the mythic . With a build like this (build 2) is the only time I notice a huge noticeable difference in how much damage I can withstand and defense capabilities

But I feel stuck between the two. I either do a ton of damage with a build like build 1. Or have to literally use the most damage reduction mythic in the game to survive even decently

I’m wondering if the PvP combat style of this game just doesn’t lend itself to creating a durable PvP brawler

And maybe the best way to survive is not to invest in health or defense as much, and instead rely on stealth, dodging, and skill based evasion. If this is the case, I may play my nightblade or another class more

Maybe this somewhat tanky damage dealer hybrid is just not viable in ESO PvP? Or maybe I’m just not that good.

I have had decent enough success in PvP and can consistently get in the top third of BG kill/death/assist but idk still seems like there’s something I’m not quite getting

I see other players, or various classes, outputting a ton of damage and surviving well