Question about Rom + Kernel

Hi Community,
(Sorry about my bad english ;) )

I get my new Galaxy S7 Edge, get root with CF-Root and flash TWRP - READY TO USE

I get install PhoeniX ROM V1.0 with use Stock Kernel.

My Questions is :
- Wifi is ON and 30minute loose 3% Akku (19% -> 30min -> 16%)
After I installl Rom nothing is App installed (Stock Rom)

Maybe I flash other Kernel is Working good?

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