Regardless of whatever you read, hear, or do, there is one rule that will get you flying very well and VERY SAFELY.

Your Falcon is a straight wing airplane. No need to worry. SIMPLY, measure the chord length that is the distance from leading edge to the rear most of the wing's trailing edge including ailerons and flaps. Do whatever is needed with batteries, weight or such so the balance point is 25% OF THAT total CHORD DISTANCE, back from the leading edge. If the chord is 10" come back 2.5 inches, 12" chord, back 3", etc. etc. No need for any aeronautical degree.

That is all there is to it when using a straight wing within subsonic convergent airflow.

Now later as things get going well, you can do small things to adjust the Center of Gravity if you feel the need. Move it forward, airplane gets more stable. Move CG back and stability becomes less.

One last point: Never trust any kit stated CG point. Some are so ridiculous that it is appalling.
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