RE: Designed a Balsa DLG
What foil have you used?
Also, a forward swept trailing edge does look cool, but actually is much less efficient than a straight one. For lightweight gliders, it is important to keep the trailing edge perpendicular to the the airflow over (and under) the wing. This helps to keep the air 'under the wing' rather than losing it to spanwise flow, which you get a lot of when you have dihedral.