Are you sure thats your build? Your AMPs are somewhat funky, Annihalation, but no AP spent on it?.
Try my build I do close to 3k single target dmg right now.
T8 Discharge and GR are a given. GR will be swapped out for T8 Quantum Cascade if there's more than one enemy.
T4 Devastator Probes is for the detonation. You'll only really be using Fissure to detonate the probes and keep the debuff up.
Atomize, Paralytic Surge, and Empowering Probes are all givens.
Restrictor will be my go to escape for boss mechanics. This is for synergy with the Entrapment Trait.
Anything can be swapped out for Urgency or Calm as necessary.
Took all the basic assault amps and exceptional t1 amps. Also speced into Entrapment for an additional 6% damage increase to the entire raid when using Restrictor.
I already said annihilation is optional, it is better in a raiding environment if you have a medic going *cupcake* spec with t8 fissure, no need for you to use it then.
Restrictor? Use Urgency instead.
T4 Dev probes not good, your group is losing out on 3% strikethrough & 3% crit chance which are important as *cupcake* for raids.
Other than that, your AMPs are pretty much what I would go for if I didnt go for Meltdown/Annihilation
I would definitely drop Annihilation in your AMPs, especially since you're not using it apparently, and put it in cooldown. The 15% cooldown makes a noticeable difference in damage output:,easier syncing Fissure to detonate Probes at the end of Probe's lifespan, more atomize, and more uptime on EP.
Also, you can /stat/ strikethrough (helooooo Brutality), but you cant stat cooldown on equipment. But 3% strikethrough is good too. *shrug*
I explained why I have annihilation, but this is a unique situation and that's why I'm using it.
I might be underestimating CDR, I'll try it out for a few tries and report back.