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Tl;dr at the bottom. I was curious to see what did and didn't stack with the new titan exotic chest piece, Hazardous Propulsion. For the purposes of keeping things consistent, Carl was bullied.. excessively.

At 6x Exodus rocket stacks, you'll gain a 35% damage boost to rocket launchers for 10 seconds. Radiant is a 25% damage boost. These buffs do not stack, but they will also negatively impact you. The lesser buff of radiant takes priority.

Lasting Impression rocket was used as it is a damage buff that has zero maintenance. Lesser values are direct impact damage. Results are as follows:

Base rocket damage 10,050 + 99,215 = 109,265

Radiant (25%) 12,593 + 124,018 = 136,611

6x Exodus(35%) 13,568 + 133,939 = 147,507

Radiant w/ 6x Exodus 12,593 + 124,018 = 136,611 (Same as Radiant)

Surge x2 (17% over base) 11,759 + 116,081 = 127,840

Surge x2 and x6 Exodus 15,874 + 156,709 = 172,583

Exodus rocket damage 28,950 x 6 = 173,700

Tl;dr Radiant nerfs your exotic damage. Surges work perfectly fine. Additionally, I could find no way to further increase Exodus rocket damage. Kinetic surge did not work

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29 days ago - /u/Destiny2Team - Direct link

Originally posted by NoLegeIsPower

Hope that's just a bug, because the 35% buff from Lumina just overwrites radiant, instead of getting overwritten.

/u/Destiny2Team

Yes, this is not intended. The higher buff from Exodus should overwrite the Radiant buff. We're currently looking into a fix.