Very important to balance according to plans as this plane has been changed by Laddie from it's original conception and original release. I have built three of these, flown two of them and am in the process of a 4th that is going to have a D/F on it and a twin post tail.

Anyway, I would balance from the trailing edge of the wing as the last reply stated. It is critical that you get this right on and have some experiance flying performance aircraft. Also I found out, both personal experiance and others in the club that built these, be careful when setting your throws on the ailerons. In fact we had to dial ours down some from the plans as this thing wanted to roll so fast that imput either way really made an unstable ship. I set dual rates and after takeoff and at playing altitude would crank it up and the thing would roll so fast the paint almost twist off.

Good luck and get some flying time with someting a little less hot.