LB absolutely depends on stats, but if you use a potion to increase it it increases the damage. Using Raging Strikes prior also absolutely increases the damage. I experiemented with this during Beta with Pugilist hitting Berserk and Raging to LB2 Aiatar. That was when I was running that dungeon 20+ times and took plenty of opportunity to measure using potions, using buffs, etc, to determine variables in LB damage. Berserk was taken away as a cross-class skill for Beta 4, but this still works for others.

Pop a potion, pop any other cooldowns you can use, hit LB. Watch things explode.

But this is only for damage.