Nice work! So you almost have root :)
Hmmm... Interesting: setenforce works without su seemingly:
D:\W10M\GAPPS\New_1.1>adb shell
/system/bin/sh: No controlling tty: open /dev/tty: No such file or directory
/system/bin/sh: warning: won't have full job control
[email protected]:/ $ getenforce...