http://www.innovadiscs.com/media/PDF/innova-driver-chart-web.pdf
Are Innova wrong? I've often found the above chart a useful reference, and further the 'turn' and 'fade' values great ways to express a discs flight pattern.
It must be pointed out, stability on a personal level can't be quantified on a chart generalized against only other discs. But, while erring on throwing things that end up being too much or not enough disc for us to handle, a standard such as this helps us determine which way to go to find that stability.
Stability to me is our ideal range, neither over nor under and may come at any point in the chart.
K.