Question about the C.G.

My H9 Edge 540 runs the saito 1.80 without any modifications. Believe it or not. I had to add 1 1/2 pounds of weight as far forward as I could (on the motor mount) And still may require more weight. I first flew it without any weight and scarred the hoola out of me... Granted I am knew at the field of aerobatics and 3D but I don't know if I can be off that much... My C.G. is at the spar or just behind the red strip. I heard only one other guy say the same thing and he apparently does not have any problems as well. Any suggestions? Am I really really off? Is this plane supposed to fly like it is tail heavy...

Appreciate any input...