In your opinion, at what point does “fine-tuning” evaluations become unacceptable distortion? Fine tuning becomes a problem when you are not accurately grading your team. You may have the intentions of helping someone out but you end up hurting them by letting them know their flaws. Although you may believe the system is flawed you have to stick with the guidelines you were given. I am not a fan of the system as it stands. I would advocate changing the system. However without agreed changes to the system I do not think they can be made.
Assume you are the vice president of human resources at Eckel Industries