Metrics

I am trying to develop a way of tracking project and team metrics using the task data in Planner.  Does anyone have recommendations for this?  Here are a few of the issues:

• On the task screen, Planner seems to constantly mangle the Effort values making the data continuously suspect.  As an example, I have a task that is 16 hours, 50% complete and it says 12.36 complete and 3.64 remaining. There are other issues like this, like having two people on a task, ...
• The "Charts" option does not provide a lot of functionality or any customization.  Also, the data is often messed up, partially related to items like the one above.
• We are using level 5 and some of the plugins that look like they might work for us do not work with this level.