Question about Spectral Throw + Lesser Multiple Projectiles

Hi,

My spectral throw does 1169.2 dps without Lesser Multiple Projectiles gem and does 900 dps with lesser multiple gem due to the 30% dmg reduction from the gem. My question is, my Lesser multiple gem is now level 18 and it has 34% increased projectile damage stat. So 30% reduced dmg + 34% increased dmg, shouldn't I be getting 4% increased dmg? Why Do I still lose 269.2 dps after equip the gem?

Thanks

Basically, because "increased" is not the opposite of "less". There's modifiers called increased, decreased, less, and more. It's a little confusing until you get used to it. This page explains things pretty well:

http://pathofexile.gamepedia.com/Modifiers

The "x% less damage" is always applied after the other effects got added to the skill.

Basically 100dmg
add LMP(lv18) 100dmg+18%*100=118dmg
118dmg*(-30%)=82.6dmg per second

At least this is how i think it works^^

all modifiers in the game are either:

increased/decreased

or

more/less


for increased/decrease, you add or subtract ALL of them toghether and then you multiply with base

for more/less, you multiply/divide each one of them INDIVIDUALY with the base.


so p.e.
you have fireball base damage 100
you have 50% increased spell damage
you have 30% increased elemental damge
you have 20% increased fire damage
you have 40% reduced damage from somewhere
you have 55% more spell damage from RF
you have 65% more aoe damage from concentrated effect
you have 35% less damage from LMP

end result should be:

100*(1+0,5++0,3+0,2-0,4)*(1+0,55)*(1+0,65)*(1-0,35)=...

...

thank you all for reply...it's more clear now