...thickness difference of approx 1/8 th inch difference between the trailing edge of the wing and the leading edge of the aileron. The trailing edge of the wing is a little over 1/4 inch and the leading edge of the aileron is 3/8 th inch.
I looked at my 4*60 and I don't see this thickness difference. Seems that the aileron is 1/4" stock and the wing TE thickness is the same.
I didn't have a chance look at the 4*60 plans, but they should show what the design thicknesses should be. You may have wrong lumber for the aileron stock.