Perhaps the only advantage of a folding kayak is that I can compare
the bare frame against the complete kayak any time. Although the applied loads
seem to have been too small to generate the results I would have expected, I can
assure you the flex of the assembled folding baidarka is adequate for good
paddling characteristics; so, if you should ever repeat these measurements
with your frame, if you end up with what I got, it is no guarantee for success,
but at least a hint that you are not completely off the ballpark.