I looked up your ARF and it has a constant cord wing. Can you measure the distance from the leading edge to the trailing edge of the wing. With this measurement you can determine where to set your CG (center of gravity). I would reccomend setting it at 27% measured back from the leading edge.

Example: Cord Width equals 10"

27% = .27

Multiply .27 x 10 = 2.7" = 2 11/16"

Measure back from the leading edge 2 11/16"