You have to change it via the McAfee Agent policy called General. this is the place that allows you to select a different branch for the patch.
In our environment, I prefer to use Policy Assignment rules and have it a point to the agent general policy that I created called "Update VirusScan Patch from Evaluation" It is shown below. I then assign a patch 9 tag. When I apply the patch 9 tag to a system then it pulls the custom agent general policy that I created for it to pull from the evaluation branch.
Man, I have no idea how I forgot about this section of the agent policy - thank you so much.