Yeah, hadn't used a kite on the mozzie when we broke the bow off. Upwind generally creates the greatest stress at the main beam (estimates of roughly a tonne of side force off the bridle). To get more stress at the beam from the kite generally requires high winds and high angles, which we've found to be slow with the kite.

Like Tim said, the inside had a small "ripple" just under the beam which I repaired about 6 months previously, but obviously not properly.