Cast on Shock - Lightning Conduit (Max Energy?)

Hey folks,

I was wondering why this is happening:

[Cast on Shock] - Has 10 Maximum Energy per 0.1 Seconds of Base Cast Time of Socketed Spells

- [Arc] (Cast TIme 1.10S) results in the expected 110 Max Energy
- [Lightning Conduit] (Cast Time 1.00S) results in 300 Max Energy. Why?

What am I missing with LC socketed in CoS?