There something weird, when i flash your kernel on that ROM i can't install any apps via ES File Explorer or Root explorer, or by ADB commands. I have to flash any permissive kernel and everything goes fine again
For the 100th time: I don't support custom(or modded) L-preview ROMS!!!
adb install works fine on Google rooted image ( I used to install Tibu and a couple other on first boot), root explorer works fine also I use that to install new apps from google that were not in Play yet.
ES file explorer needs update I think, not even worked with first l-preview.