I get 12 hours with WiFi off and 10 hours with WiFi on (other than for syncing) on my Paperwhtie. I use the light setting at 22 all the time.
Your results are well within my range so there is nothing wrong. Each unit may vary a little from other units depending on the type of usage.
Your own difference between one firmware version and another may reflect your specific usage during that cycle.
Frankly, I'm leaving WiFi on all the time now in the day and shut it off only when I sleep in the night. An hour or two difference is irrelevant.
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