Very good points and questions, personally, the way I would handle this is not to break it down and worry too much about gear score, etc, sure gear will impact your performance, but since you are just competing against yourself, having better gear helps you have better performance.
The other factors are the system would be for pre-maids because I could see issues with random groups, players going for a "high score" and upset that someone isn't giving them more buffs, or something.
And as for the data center aspect, it would look at that content, and rate you as a % of the job, or like others have said, a score on how you did. You can do this by removing utility from the equation, and many other options. It's more of a math problem from how I look at it.![]()