I don’t have an solution, but I could suggest ways for you to troubleshoot this issue.
We put out a newsletter with some stunt profiles a few years ago. You could take a stunt profile designed for monitors and put in place in your workflow to determine if your profile is actually being used or not. The “monitor weird” profile, for example, will definitely show a difference when you put it in place. This can answer some questions, confirm some assumptions about whether the profile you think is there is really doing its job. It’s good for troubleshooting.