Incinerate additional damage

Basically i made a custom hero ability, based on original non-autocast passive incinerate, and it works fine, except that it does not add incrementing damage.

Meaning that if a hero does 60 damage a hit, with +10 damage incinerate, he does 60,60,60,60,60, instead of 60,70,80,90,100

How to fix?

Someone?
Anyone?

I heard that custom abilities based off incinerate are iffy. Don't know personally though.

So my best bet is simply use the original incinerate with altered stats?

Yes. Normal incinerate is very prone to not working.

In fact it doesn't work (damage buff aside).

Or trigger it. Not actually very difficult. I've never played with incinerate so I don't know what problems might come up (and trigger it is such an multi-purpose elegant answer don't you think).