There's not enough information in the OP to determine if he actually has a CG problem or not. What does "flying like a kite" mean? If the elevator was too sensitive, then you may just have too much elevator throw. If you mean that the wind tossed the plane around a lot, then welcome to flying Cubs. That's what they do. On a scale plane like that (and for the initial setting on aerobats and sport planes too), I tune the CG based on how the plane lands. If I can hold flare all the way to the ground, the CG isn't too nose heavy. If the elevator feels sensitive even as the plane is settling in, the plane is tail heavy. Checking out the difference between upright and inverted is a good second test also. The less forward stick is required to maintain altitude while inverted, the closer the plane is to the neutral point.

So how about some clarification about what exactly the plane did?