In practice it has been found that ailerons thinner than the trailing edge of the wing tend to lose control effecticeness around the center. This can be particularly true at low speeds. I noticed this on a friend's trainer many years ago.

Generally, it is better to have the ailerons slightly thicker than the trailing edge. This gives better control.

If your plane is built and you do not want to build up your aileron thickness, try reflexing both ailerons up slightly.