Not to mention that there are a few things that I have not seen tested.
1: SS Increases DOT "Potency" Direct Modifier to it.
2: The Next Thunder X will add it's full damage over time amount to it's initial damage - Is this value altered by the change to Thunder Dot Potency.
Example
T3 - with 1150 SS. Say this value changes the DoT Potency to 44.4 from 40/tick.
Would the T3 Proc be worth:
425.2 + 355.2 = 780 Potency
compared to at 354 SS:
390 + 320 = 710
Or
390 + 355.2 = 745.2
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All of which are fairly significant.