On a second look-through, here's what I found:
-Under the "Important Stats" section, SP is listed before hit. Under "Stat and Gearing - Priority", hit is listed before SP
-Under "Damage Bonuses" in the Math section, I read the following:
correct me if I'm wrong, but CC is the 110%, Ferocious Inspiration/Sanctified Retribution/Arcane Empowerment, and the 116% is supposed to be Curse of Elements/Ebon Plaguebringer/Earth and Moon. If so, the 116% should be 113%


EDIT: not quite sure why the font got so large

That math section could be out of date (it was from Bink's original article). I'll doublecheck the numbers and update it when I get the chance.

The "Important Stats" section is more of a general caster class description rather than a mathematical comparison, and it doesn't go into caps or anything. I can see how it might be confusing as written, I'll look at that soon.

(Also I'm pretty sure the font got large because you copied the header tags)

The combined strength of raid damage buff + spelldamage buff is 116.39%, so I'd guess it was just a typo/brainblip accidentally using the combined figure instead of the proper 113% for CoE. I can't think of any other reason why it'd be listed as 116%.

[e] Reworded for clarity.

The only other thing that was bugging me was the "Unknown" coefficient beside Tstorm.

I took it upon myself to do some testing on this. I took off all trinkets/ring that had procs, no CSD, respecced out of Concussion and anything else that might affect damage (was specced into Elemental Fury, however). I tried this with 2990 SP, 1005 SP, and 0 SP to try to make it consistent. No Curse of Elements, no Elemental Oath, attacking a level 60 target dummy (to avoid partial resists)

The base damage of my tooltip (and 0 SP findings) is 1450-1656, giving a range of 206 damage. Averaged out, that's 1553 base damage.

2990 SP
high: 2165
low: 1964
range: 201

(2065 + 1964) / 2 = 2064.5 (average damage @ 2990 SP)
2064.5 - 1553 = 511.5 (damage from SP)
511.5 / 2990 = 0.171
coeff = 17.1%

1005 SP
high: 1819
low: 1625
range: 194

(1819 + 1625) / 2 = 1722 (average damage @ 1005 SP)
1722 - 1553 = 169 (damage from SP)
169 / 1005 = 0.168
coeff = 16.8%

0 SP gave base values consistently.

so... Coefficient = ~17%

Working with this number...
2990 SP
max: 2164.3
min: 1958.3

1005 SP
max: 1826.9
min: 1620.9

Ok, so from this we can gather that it's a bit higher than a flat 17%. Doing the same math assuming a 17.1% coefficient seems to fit the sample data perfectly.

We would expect the coefficient to be:

Base cast time / constant * ( 1 - # extra effects * penalty )

Cast time is instant so = 1.5
Constant for AoE = 7
# extra effects: knockback + mana restore = 2
Penalty is apparently "normally" 5%, though not always (e.g. both ES and FrS seem to suffer a 10% penalty)

Feeding that through using your experimental result of 17.1% gives a total penalty value close to 20%. Assuming it is 20% and feeding that back through would make the coefficient 1.5/7*(1-0.2) = 17.14%

So as your experimental result of 17.1(4)% seems to make sense based on "the rules", I'd say bravo!

An extensive rewrite of the TTT is in progress, and should be complete soon. Please bear with me as there is a lot to go over and many changes were only recently finalized.