That wing looks like the sort of thing that comes with a flat bottom airfoil. Keep in mind that the flat bottom is not what you use for setting the wing incidence. You need to use the point at the most forward part of the leading edge to the point on hte trailing edge as your reference line. If you set the flat bottom to +1 you may very well have +2 to +3 of actual incidence. IN any event I'd set the wing at +2 to the actual centerline. That would be a better beginning point for this sort of model.