over 1 year
Currently, Explosive Arrow has three skill parts -- Arrow, Explosion (1 fuse), and Explosion (5 fuses). This made sense under the old model where there was a limit of five fuses and the explosion only happened once per monster (typically), but is not very useful with the 3.9 changes to the skill.
The parent codebase has already added the weapon damage contribution that was added to the explosion in 3.9, so that at least has already been updated to match. But none of the existing parts accurately model the damage profile of the average explosion you will get, and particularly the numbers for the resulting ignite are nearly useless for optimizing a build as currently implemented.
Under the new model, an explosion happens every (1 * skill duration modifier) seconds, and ignores your normal attack rate. Instead the attack rate contributes to the damage of the explosion, and also counts towards a further more modifier to the ignite.
Basically I think the Explosion (5 fuses) part of the skill should be removed, since it is no longer relevant. Explosion (1 fuse) is still useful as a way to see how much damage each arrow is contributing, so it can stay. Then a new part needs to be added called Explosion (average fuses), with the following stats:
"arrows landed" in all these formulas is = (arrow attack rate) * (arrow hit chance) * (duration modifiers)
With this in place, hopefully we should be able to pick this part of the skill and have the effective DPS calculations come out correctly. There are some intricate effects caused by the nonstandard way this skill works; eg. +duration mods increase ignite DPS and the average damage of the hit, but the DPS of the hit is unaffected. Adding accuracy will increase ignite DPS if you are not at 100% hit chance yet.
That said, this is not a perfectly accurate model; in particular it breaks down when less than one arrow is being fired per second. But it should be accurate enough for the usual case, I think, and will go a long way towards being able to optimize builds for EA in the future.
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