I would lock GPU to 200 MHZ it's enough if you do not play. Also it's good to disable 2 cores. Is there such an option in your kernel?
Also please can you share your setup with us? I am interested in CM13 base.
Can i use CM11 base on SFOS 2.0.4.13 or 2.0.5.6? I am locked to SFOS 1.1.29.8