Lua Weapon script problem.

[Moj mistrz]

Hello, I want to make a weapon script for example stonecutter axe(in lua), but the problem is that damage factor dont work(or i'm using it wrong XD).

That's the script.
NOTE: it works very well without using FACTOR, but it dont matter if i'm using full def or full atk, it's still same dmg.

    <melee id="2431" level="90" unproperly="1" script="sca.lua"/>

local combat = Combat()
combat:setParameter(COMBAT_PARAM_TYPE, COMBAT_PHYSICALDAMAGE)

function onGetFormulaValues(cid, skill, attack, level, factor)
    return -(level / 10), -((2 * (attack * (skill + 5.8) / 25 + (level - 1) / 10.)) / factor) + (level / 10)
end

combat:setCallback(CALLBACK_PARAM_SKILLVALUE, "onGetFormulaValues")

function onUseWeapon(cid, var)
    return combat:execute(cid, var)
end

I've already used setOrigin(ORIGIN_MELEE) and it didn't worked(I thought it will fix the formulas by itself without adding any formula to script).