It seems as of Update 36 and Update 37, the most logical conclusion of a pure heavy attack damage setup for pretty much all classes ends up in a medium armor setup with Storm Master and the heavy armor set Sergeant's Mail in the form of jewelry and weapon.
With Oakensoul as a Mythic item that restricts other Mythics from being used and also restricting the usage of a second skill bar, we don't have too many options in terms of set availability and also makes us resort to a 1x bonus set such as Slimecraw's 1x Critical Chance bonus.
After some testing on both the raid dummies and in content (also based on previous testing with a different iteration of Oakensoul), it doesn't seem the Berserker enchant (Weapon/Spell Damage increase) will outperform either Poison or Flame Damage enchantments on the Lightning Staff.
Jewelry enchantments can be Weapon Damage glyphs if you have a Dragonknight in your group that can provide the Minor Brutality buff. Other than that, it can be either Weapon or Spell Damage.
An alternative body setup can be 5x Noble Duelist's Silk or 5x Order's Wrath!
Why we go with Elemental Blockade is specifically because of its longer duration that compensates for the much shorter duration and the necessary upkeep of Daedric Prey. While you can do Unstable Blockade of Storms to use as a semi-spammable, for actual content it may be better to use Elemental Blockade instead.
Hardened Ward is a great skill to cast for your added survivability although Critical Surge will probably be better for solo arenas like Vateshran Hollows and Maelstrom Arena.
While understandably a lot of people don't like to use pets as Sorcerers, it's undeniable the amount of passive damage you gain from slotting the two pets especially when used in conjunction with Daedric Prey. Added on top of the damage is also a passive Max Health gain for simply having a pet summoned.
Ultimates will either be Greater Storm Atronach or Power Overload depending on content. In pretty much all areas, Power Overload will outperform Greater Storm Atronach, at least when it comes to single target and cleave damage.
More than likely, as of Update 37, Power Overload will enable the Sorcerer heavy attack build to get close to 110,000 DPS based on some calculations. Timing and getting used to the toggle nature of Power Overload however will be the main obstacles to mastering the Ultimate's usage.
Champion Points Review
Just as Hardened Ward is a flex survival skill, Bastion which amplifies the effect of Hardened Ward is also a flex Champion Point slottable so you can go with Expert Evasion or other slottables from the Fitness tree if need be.
Fighting Finesse should push your Critical Damage in Trials content (provided buffs like Elemental Catalyst are present) to the critical damage cap. For dummies and 4 man content, Backstabber will be fine.
Deadly Aim, Weapons Expert and Exploiter are basically essential to increasing your damage ceiling due to the nature of heavy attacks.
Two Immortal Redeemer runs with three Clockwork Curator polymorph drops can be found here.
Want to do some funny damage without much effort? Well this build is for you and while it may have gotten a Trial Trifecta (Immortal Redeemer, Veteran Asylum Sanctorium Hard Mode), there's no reason why you wouldn't be able to use it in other, less demanding content such as dungeons or arenas!
Recommended race: Altmer (High Elf) or Dunmer (Dark Elf); for solo or 4-man content you can go Khajiit.
Recommended food will be a bi-stat Health and Magicka food.
Recommended Mundus will be The Thief (for group content like Trials) or The Lover (for solo content and overland).
Potions can be your basic tri-stat restoration potions, however if you'd like to invest further into the build, you could go with Resistance Potions that restore 9206 Health immediately & gives Major Fortitude (30% Health Recovery), grants a unique 5280 Spell and Physical Resistances!
You should have almost 25,000 resistances, making you basically a tank with around 30,000 Health (includes Minor Toughness if in group with a Warden).
The potion can be made using the following reagents: Mudcrab Chitin, Mountain Flower, Bugloss