People get really excited about processes. Let's put a proces in place! Let's do this! Let's do that! The bottom line is a good process should be no more complicated than it needs to be to get the job done. Nothing more, nothing less. If your process does more than get the job done, the additional work is wasted. It doesn't add value. It is called gold-plating and is a waste of time.
If the process isn't sufficient, you will continue to see errors and variability happening around the work the process is supposed to help. In this case, you need to revisit your process and map it out.