You should use either the complimentary or Kalman filter or you won't be able to make it balance!
Sounds like you are not that happy about your co-workers? What is your profession?
See the following example on how to include the Kalman library: https://github.com/TKJElectronics/Example-Sketch-for-IMU-including-Kalman-filter/tree/master/IMU6DOF/MPU6050.
The simply is to simply add it next to the .ino file and then add it like so: https://github.com/TKJElectronics/Example-Sketch-for-IMU-including-Kalman-filter/blob/master/IMU6DOF/MPU6050/MPU6050.ino#L19.
Hope you will get it working before your deadline!