It is so cool you are having fun with your plane!

Just to make sure, because I see the CofG is a big deal in this plane, and specially because it looks TOO much tail heavy to me.... I am attaching an image to this posts, just to make sure that I am measuring properly the CofG......

basically what I did was to measure the 96mm from the front edge of the wing and mark 96mm, then with a long ruler, I transfered the mark to point A.....

1. is that the way to do it???? If so, my plane is still reaaaaally tail heavy.... I wonder if it is because the OS 46 is way lighter than the 55, OS-70, saito 80...
I am planning to epoxy some metal pieces to the engine mounting to make it nose heavy...

2. This question is completely different, I am using HS425 servos (hitec), they are standard, I believe 46oz.... the ailerons move nice,fast and freely, clear sign that the servos are good enough.. the thing is that when I stop applying movement to them, and at the point where I believe they should center... they do not!!!!! I mean, just some mms out of center but I thought they should center ALWAYS.... why is this??? gonna have trouble in the air???? I do not know if it is because the surface of the ailerons are very big and might be big load for the servos or it is just normal..... I do not have handy 2 servos of more torque...</p>