a lot of people say that draconic should have evo/coj +1 per core, but I think It should be more valued because draconic is the master of pure power and the current version does not show the concept very well.
We might need some revised version of the epic as something different.
So I wrote something for an example. (apologies for my bad English sentences as I'm not native.)
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Core 0:
Passive: You gain +50 SP, and +2 evo/coj DC, 10% spell critical damage.
Active: You gain "Elemental Focus Stance" ability. this has a version for each element - "Fire/Air/Water/Earth Focus Stand". you can only activate one of Elemental Focus stances.
During Elemental Focus Stance, Your elemental focused spells gain double benefit from the core passive abilities.
[Explanation]
Let's say that You're in Fire Focus Stance.
if you cast Coldray, Your bonus is +2 evo and +10% crit dmg.
if you cast Fireball, Your bonus is +4 evo and +20% crit dmg.
Core 1:
Passive: You gain +50 SP. When you cast Elemental Focused spells, 5% of the cost will be back to you.
Core 2:
Passive: You gain +50 SP. You gain +2 evo/coj DC, 10% spell critical damage.
Core 3:
Passive: You gain +50 SP. You ignore 10% of saving throw effect.(you penetrate saving throw effect by 10%.)
[explanation]
50% dmg reduction on save -> 40% dmg reduction / 30% while stanced
100% dmg reduction(=evasion) on save -> 90% dmg reduction / 80% while stanced
This does not apply to dmg reduction by elemental resistance(like fire to fire ele)
Core 4:
Passive: You gain +50 SP. You gain +2 evo/coj DC and 10% spell critical damage
Core 5(Draconic Fury):
Passive: You gain +50 SP. You gain +1 Maximum caster level for Arcane Spells.
[Current] Active Ability: (Cooldown 4 mins) +50 Spellpower for 20 seconds.
[Suggest] Active Ability: (Cooldown FIFTEEN mins) for 20 seconds, You gain +50 Spellpower and your stance bonus is increased to 4-times than double.
Total Bonus:

Draconic Fury will be useful if we get like this.
I understand the value is somehow too high, but Dragon Fury is something ultimate so I thought It should have as cooldown 15 mins.
and Basic Stanced benefits are considerable, I think? Dragon Fury is just too much.
Considerable means when we compare to Wizard guys, Sorcerers should have something attractive than theirs such as Magister's untouchable DC. and those values are only for when you cast a spell of a certain elemental.