More damage out of Thrust and Blade Storm

[Jibby]

Okay, I learned this fighting some Piratas and stuff in the Lava Gorge.

This is a way to get 100-500 more damage on your cutlass attacks.
Let's use my pirate as an example. Jibby, a LVL 28 with a LVL 26 cutlass. I have fully upgraded Thrust and Blade Storm. Basically, five points in each.
Now, you have to understand this:
The maximum damage you can deal with Blade Storm is 960.
The maximum damage you can deal with Thrust is 528.

Let's say I head to tormenta and find a LVL 30 dregs, and attack him for some rep.
When I hit him with thrust, I may get 742 damage instead of the limit, 528. Or I could use Blade Storm and get 1253 damage.

I don't know what causes this, and why it doesn't always happen, or how to activate it. All I know is you can get more damage, and I haven't researched flourish, cleave, sweep, etc.

The biggest amount of damage I've given to an enemy using this is:
1387 using Blade Storm.
938 using Thrust.

That means I got 427 more damage with Blade Storm than the cap.
That also means I got 410 more damage than usual with Thrust.
Pretty cool, no?
-Jibby