Ok I see a couple problems with the build. For Nova, its better to go for a more balanced build, because she can use all of the stats.
First, Id recommend to go for 2 augments: Neutron star and Molecular fission. Why? These 2 augments synergize extremely well with each other. With only Stretch, thats 23m radius seeking radius when recasting with Null star, and all the enemies hit are procced with heat and primed. So the gameplay is just keep recasting 1 when you have less than 90% damage reduction, and thats enough to prime all the enemies nearby, which means you only need to cast her 4 occasionally. This is very energy efficient.
Secondly, since you dont cast 4 as often, Archon stretch is more than enough to keep your energy up. You can safely ignore energy. Zenurik can help if you still have trouble.
Thirdly, Nova is very tanky with 90% damage reduction. Add Adaptation and shes very unlikely to go down. So I recommend go for shield tanking instead, as both her damage reduction and Adaptation apply to shield. With Arcane aegis and Guardian from companion, you can tank very comfortably.
So the build would look something like this: Aura: this is flexible. Id say either Growing power or Corrosive projection, but its up to you. Definitely not Dreamers bond though. Exilus: either Primed sure footed, Preparation, or Handspring as the last resort. 2 augments: Neutron star and Molecular Fission. Adaptation for survivability. Archon Stretch for range and energy. Primed Continuity. Arcane: Arcane aegis + Molt efficiency. Focus school: either Zenurik or Madurai. Unairu is good if you dont have Primed sure footed.
Which leaves you with 3 flex slots. You only need 50% strength to max her 4, which is easy with 3 slots and archon shards. For a non archon shard build, you can go for Intensity, Augur secrets, and Natural talent. This should be a well rounded build.
Bonus: Ocucor is good, or any strong secondary. Its a strong weapon, but the reason its good is because of Secondary fortifier. Nova is already tanky, but with overguard from Fortifier, you are pretty much immortal.