Hey, that's what I was told in the DK thread, they said to let the rom settle for a couple of days. The first day I flashed the rom I was getting 4 hours of screen on time, three days later I started getting 6 hours of s.o.t. They had an explanation as to why this occurs but I forget what they said.
If you don't trust that, try recalibrating the rom by downloading an app that deletes the battery stats file.
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Running Dynamic Kat 4.2 with GPE Simply White on the Note 3!