Default [Q] Can't install lean kernel on cm11 note 3 sm900t

Hi! First post here.

Trying to install lean kernel on my t-mobile note3 with cm11 8/21 nightly installed.

I downloaded the aosp version and flashed with twrp. After cache wipe and reboot, there's no mention of lean kernel in settings info. It just says stock cm kernel installed.

Any help on this would be appreciated!