Here are some extra thoughts on how to use your existing time and performance evaluation process to get your B players more engaged. B players are not necessarily coasting or hiding, many are waiting. Waiting for someone to ask them to help. Waiting for someone to give them some feedback, to say it is okay to not want a promotion, and to recognize they have lots of value to the organization.
Do NOT hide behind the performance evaluation form or process as being a barrier to having a great conversation with your people. It is NOT the form.