Ken,

It's very useful to know where your CG is along the MAC (Mean Aerodynamic Chord). This is almost always expressed as a percentage of the line back from the leading edge, and that percent can be duplicated across different wing platforms with consistent performance results. The "roll over and see how fast the nose drops" CG test is inaccurate because that is also affected by thrust and incidence settings, and mostly irrelevant, focusing on that makes one or two things easier while ignoring more important criteria like tracking and rolling. I realize you are relatively fresh and flying the lower classes but I highly encourage you to try and absorb some of the fundamentals so that you can see success in the future should you move up in classes and start flying some more complicated maneuvers. I'd recommend reading Triangulation Trimming at http://www.ckaero.net/blog/triangulation-trimming-2/ . It's long but makes a good read for anyone who loves this stuff as much as we do

Here's a link to a useful MAC calculator: http://www.friendlyflyers.org/cg-calc.html