I have experienced similar flying characteristics, but mine is the older kit with the semi symetrical airfoil and I assume yours is the symetrical version. The older type of wing will behave as you describe. I also have a new foam wing with the symetrical airfoil, but have not flown with it yet. My COG is 4.75"

The rudder I find to be almost ineffective at slow or no speed. I am not a designer. I just don't get the tail feathers. I do enjoy flying the Tiger60, but I cant imagine using this airplane as a pattern craft. I have a Swallow ex 90 for that. I tend to use the Tiger as a "warm up plane" when I'm feelin rusty. Although this winter I've been finding it challenging too!!! - Not enough air time.