Moonfire

[Watto44]

Moonfire is a so called "binary" spell, and therefore has its bonus damage devided between the two parts of the spell and modified by casting time.

So the direct damage part receives 50% of 43% (because it's an instant) = 21,5% benefit from spelldamage. The DOT receives the other 50% spread over it's duration. This is not exactly what you found, but i think that's due to the low sample size of your research.
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That was the result I got with my theory craft for the initial damage. For the DoT, I assumed that the damage it received would be adjusted because of it's duration. (Twelve seconds instead of fifteen.)

While the small sample size can explain the disparity in burst damage results, the sample size doesn't really explain the difference in the DoT result. Given that the DoT is a fixed number, a smaller sample size should produce reliable results.

Ideally I'd like to be able to test this with higher +damage gear, but 110 maxed me out. :) Either way, I'm going to do more testing today to both increase the sample size and vary the amount of +damage I'm using.