RE: c of g help
As Jan says, the important thing is how it flies.
You need to be able to identify nose heaviness and tail heaviness in flight
Nose heavy planes don't fly well
tail heavy planes fly only once unless you are mighty lucky
A nose heavy plane seems to reset a good landing flair and will not do a true spin.
A tail heavy plane resists coming out of a spin and gets so squirrelly on approach to landing that you can never get the attitude right for landing. it will oscillate up and down on you