How does looting really work?

[lerzba]

I started leveling cutlass at Tormenta and only got rare swords along with a famed and cursed blade in a hour and half. But I got no rare pistols or dolls anything.

I started leveling pistol at Tormenta with a blunderbuss and I got 3 Rare Pistols in a hour and half but not even one rare cutlass/other weapon.

I started leveling staff from level 2-7 at kingshead for like 15 minutes and I got 2 staff loots.

It seems as if I use a pistol to kill enemies, I get the best chance to get pistol loots, if I use staff, I get the best chance for staff loots, does looting work this way? Is it based on what weapon you use?