I haven't really been around on the forums too much recently. However, I have noticed there is still a pretty large debate that doesn't seem to be anchored in real numbers around whether or not using Soul Fire in meta or caster form is better. So, since I had some free time this evening, I figured that I would try my hand at putting together a tool for people to figure out which is better for themselves with a little more ease.
This is what I came up with:
https://docs.google.com/spreadsheet/...tdjdTSHc#gid=2
If you have a google account you can go to 'File -> Make a Copy' and put your own values into the Parameter fields. Doing so will give you a very clear output on what numbers you should expect from your gear.
In the Damage Gain section you will see two numbers, the top one is the damage you gain from replacing Shadow Bolt with Soul Fire (per second) and the second one is the damage you gain from replacing Touch of Chaos with Soul Fire. If the Caster Soul Fire number is higher, you should always be using Soul Fire in caster form. This will mainly be the case at low levels of haste. If both numbers are very close I would default to using Soul Fire in caster form, as you are spending fury for virtually no change in damage, effectively throwing away the damage increase of ToC over Shadow Bolt. If the damage if far higher, which happens at high haste levels (mainly during haste procs) you should always be casting Soul Fire in meta.
Tell me what you think about it, what I should consider changing and if there is anything else you think would be nice to check quickly in a format such as this.
I did not add in the crit scaling that Soul Fire gains, as I felt that it would bloat its damage over the other spells if I didn't give crit compensation to the other spells. However over the course of a fight they should all gain about the same benefit from crit (Soul Fire just guarantees benefit).