I recently rolled around 10 uvs in a row, and got:
Dark Retribution slime high
Sealed Sword CTR VH
Gigawatt Pulsar CTR VH (:/)
Then about 7 low uvs that were completely useless on their respective weapons, like fiend low on Acheron
Does the probability of rolling a good uv go down the more you roll? How can I max my chances of rolling another few boss uvs?
There's nothing you can do but to cross your fingers.