Chain Lightning "next target" damage increase from stat Trigger?

[sicpher]

I kinda need help with this Chain Lightning trigger,

my trigger only increases the "first damage" landed on enemy based on %stat

How can i increase the "next 2/3/4 targets" using the stat points? Is there a trigger for this

 

[jomik]

Trigger the whole chain lightning
Just base it off channel or something, and make a dummy cast Finger of Death or something, with another effect?

 

[Komaqtion]

Here is a good tutorial about just this:
Chain Spells, by Daelin