The results seem to compare with my experience with kayaks and marathon canoes. Damage is usually caused by hitting a rock, which causes a compressive force from the outside. The damage I always observe is a crack longitudinal with the boat and the grain of the strips, on the outside of the hull. The fiberglass on the inside of the hull almost never breaks, though it is in tension under this situation. This is consistent with the data which shows the samples with strip orientations at 90 degrees failed at lower loadings, with the failure on the side of compression. No rocket science here.

Now the question is how can we reinforce this weakest orientation in a strip hull in a practical manner that doesn't add excessive weight?