Rubicon Ignite Calculator

In game calculator for seeing how many fire mages should spam fireball, and how many scorch, to give the highest raid dps from rolling ignite.

Inputs
Mages: how many mages are in your fire group, from 1 to 6.
Team crit %: the average crit chance of the group after accounting for misses, since a miss cannot crit. Do not include the Imp. Scorch bonus here.
Imp. Scorch: tick this if your scorchers have the talent, which gives +4% crit to Scorch only. Fireball is not affected. The tick applies to every scorcher in the group.
Startup (s): the time the opener takes, Scorch, Pyroblast and Combustion with Fireball spam. The table models the steady state after Combustion is used up, so this time is taken off the fight length. Default 18.
Fight length: 45, 60, 90 or 120 seconds.

Reading the table
Each row shows a combination of scorchers and fireballers. The number is the median time until ignite drops, with random timing offsets between mages. Basically, after finishing combustion, this is the time you can expect ignite to randomly drop off after.
The green row marked < is the best fit, showing the most fireballers whose ignite still lasts as long as the fight minus the startup. If no split gets there, the split that holds longest is shown and a note says so.
The model assumes a constant crit chance and all mages to pop Combustion after the opening 2 scorches.

Rotation
Everyone opens with 2 Scorches -> Combustion with Pyroblast -> Fireball until Combustion is gone -> spam Fireball or Scorch, depending on if you are a fireballer or a scorcher. The last part is the only part that changes between scorchers and fireballers!

Credit
Addon by Kenitra of Rubicon
Shoutout to Ronkuby, who wrote An Analysis of Ignite Hold Time.