I agree completely with Mike K. about this change...It's totally unnecessary to make the wings symmetrical. That said I seriously doubt if anyone would care a whit if you were to do it.
Areodynamically I would personally not make the wings symmetrical but might consider making the outboard wing just a bit longer so that the total assymetry was about 5/8 inch. That would make it closer to the actual speed differential between the two wings. Again it really isn't necessary to do that, I've seen several of these things fly at VSC and they seem to fly very well as designed!
The rules for changing things are a little bit more specific for OT than Classic. At least that's very true for VSC and most other contests I've attended. No one takes a ruler to anything. If you were to do something really obvious like moving the landing gear from the wing to the fuselage or something obvious ...like extending the rear of the fuselage by 5 inches someone would probably notice but I doubt that a 1/2 inch more or less of wing span would ever be noticed...or that anyone would care!
Randy Cuberly