As you look at reports like these, it's important to always use a 90 day average on any area you want to improve. Why 90 days? Because months fluctuate - while 3 month rolling averages are your trend. We call your 90 day average, your 'current average' in that category because anything past the last 3 months is really just 'history', and is no longer current.
From your report, list the managers who work deals and their current averages for front end gross, F&I gross, deals they work and deals they deliver. Then write in your realistic potential if all managers improve, at least some.