Need help with Explosive Arrow explosion calculation

Hi there,
I've been playing EA build and need help calculating my blast when 5 arrows are stacked /with Quill Rain/. Need a confirmation everything I write is right.
So lvl 20 EA damage per one arrow is (523+ 785)/ 2 = 654 fire dmg.
5 fuses to ignite from = 3270 fire dmg.
I have 330% increased fire and elemental dmg from tree and gear /. 3,3/ = 10 791 dmg
I use conc effect / .1,7/ = 18 344,7 fire dmg
Use of EE /.1,5/ = 27 517 fire damage of the initial explosion.
Is this right ? Then the fire and elemental dmg and EE apply on the burn too ? Thank you!

You can also use projectile damage if available, it will also apply to initial hit and burn from ignite, same as AoE damage.

The calculation is fine if an enemy has 0 fire resist, but you can't really know that in advance so it's ok like this. Fire resistance affects fire damage over time too, of course.

Thank you!
Does 330% increased fire and elemental dmg means 3.3 multiplier ? So if i do 1000 base dmg it will mean 3300 fire dmg, not 4400 dmg ?

It's 4,3, there's also the base. If you get 10% increased damage it's not a 0,1 multiplier :)

Nice ! Thank you and good luck