Do you have one of these wing incidence meters?
http://www3.towerhobbies.com/cgi-bin...&I=LXET66&P=ML
If not, they are a good investment. A general rule of thumb is that your wing should have somewhere between 0 to + 2 degrees of positive incidence. (meaning the wing should be angled up in the front about 1 or 2 degrees. With that meter, it fits right on the wing of your plane, and it has a little needle that moves back and forth and shows exactly how much incidence you have.
David