Defense vs Damage balance

3.0 release introduced insane buff to Glacial Cascade, it wasn't hard to predict that Sarn Arena will be tightly filled with GC miners during Harbinger league, thereby it was a great opportunity to test what the game offers as an effective (and ethical) non-legacy defense against spell damage.

So, the Defense:
8685 eHP, 75/75 block, 693 life on block, 0/46(54) dodge, 26% flask effect Avenger's Aquamarine Flask, Soul of Solaris, Soul of Yugul, Harbinger of Focus, Fortify, 75(149)% cold res.

it's 91% chance to avoid spell cold damage with 5(13, 25, 45)% reduced cold damage taken (from hits), 20% to get 50% less damage form Glacial Cascade, unaffected by extra damage form crits, chill, elemental weakness.

The Damage:
Generic Glacial Cascade miner, 58% cold res penetration, Minefield, slightly less that 90k GC tooltip damage, (0, 35, 50, 65)% Block Chance reduction.

The goal:
Being able to survive a single stack of GC mines w/o using CwDT.

The result:
65-50% BCR negates all defense investments, you simply have no chance. (36-30% chance to take cold damage, 26-37% block apparently equal to "getting oneshot each time")
35% BCR is enough for instant kill with each 2nd stack (25% chance to take cold damage)
0% BCR simply doesn't work, 693 flat hp on block can keep the build alive infinity amount of time. (8.6% chance to take cold damage)

Conclusion:
I believe there's nothing else can be done to improve the build defense. Whatever investments have being done the build unable to avoid oneshot from 65% BCR setup.
for reference: 65% BCR will cost you one 20/20 Gem and two 15% BCR prefixes (crafted for ~ 200 Orb of Augmentation).

Suggestion:
PvP damage reduction formula should consider number of hits the target takes per frame / certain amount of frames from attacker. Or you may just override T constant for Remote mine and Trap to 0.01

Ruthless is a fun gem for sure, too bad it makes irrelevant any intermediate state between "immune to stun" and "use nothing related to stun avoidance".

8685 eHP, 62% stun avoidance, 44-84% increased stun recovery, curse immunity.
it's 0.24-0.19sec base stun duration, 38% chance to get stunned by stunning hit.

vs.

RT Dual Strike with Stun Support, Ruthless Support, 60% stun duration belt, Stun Mastery, and that's it.

The goal:
Escape from stunlock while using no "immunity to stun" items.

The result:
it's impossible. No matter how pathetically low the attacker's damage, if it can stun — you gonna stay there forever writhing in stun recovery animation.

Suggestion:
Buff Cloth Belt implicit to at least 79.8% increased stun and block recovery.

8685 eHP, lvl 21 Arctic Armor, Glitterdisc.

vs.

One of authentic EA users from this thread

There is no noticeable difference between using AA + Glitterdisc and just standing afk.
6.4k life is too low to make use of 9.8% life regen, overlaped AoE EA damage is too high, 1v1 arenas layouts are too spaceless for being able manually dodge any of EA volleys.
Fire Aegis will change nothing.

Suggestion:
Nerf Deadly Infusion.

Why does this game aspect left rotting down there?
Can you please finally fix Zerphi's Last Breath interaction with Blood Magic?
Blight, Death Aura, Gloves Enchants etc.