My Tiger 2 ARF did the same thing....it was balanced properly but very light on the nose wheel. One thing I did to counteract the effect was to make sure the nose gear was down as far as possible, to where the spring part of the gear was almost touching the fuselage. Just make sure it's not touching and your nose wheel turns freely. The plane will sit with a little bit of a front rake. It has no effect on the way the plane takes off or lands, but it helps to keep that nose down.

Mike