Ahh the 6.0, I haven't seen one of these reports in a while. While I ran 10w-30 at 7,500 mi. OCI I don't think viscosity ever fell below 10.5, I do remember a Rotella 5w-40 sample dropping to 9.8.
Your sample looks great, keep on trucking. I wonder if the rev-x actually helped with viscosity, I've heard its carrier oil is quite heavy.