The hand-toss foam glider is probably not designed for that high of a g-load on launch. A couple of options for adding strength to the glider so that the wings stay intact. You could modify the sweep angle of the wings, basically convert it to more of a delta-wing, will need to re-balance it so that you get a good glide. Also, you can add some strength by applying strapping tape, the kind of packaging tape that has the strings embedded in it. On RC planes with foam wings you can put that on the bottom only but you might consider putting it on the top as well. Or, like on Frank's kits, carve out a groove and epoxy/glue a reinforcement carbon fiber, or maybe just a thin wooden dowel, as a structural spar from wing tip to tip. Lots of options, challenge is to add enough strength while keeping it light. (I wonder if the tail was strong enough itself, but got damaged by the wing when it ripped off?)