I am rooted, unlocked, stock. So I just run those scripts in the program listed and that's it?
Yes, install the app then run it and choose to run the test (you'll have a Superuser request, accept) then reboot:
After if init.d script works you'll have an init.d folder in /system/etc (and the message like above). Put the init.d script named 01vibratorstrength in the init.d folder and set the correct permissions like in the OP.
Run the app again and activate the init.d script, set to ON like the screenshot:
Reboot again and all will be fine. You'll feel that the vibrator strength is increased (wait about 1-2 seconds after boot). You can check the values are changed by following the path /sys/class/timed_output/vibrator/**** (the vlaue you want check and you have changed).
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