Appreciate all your insights about various technology--esp. the waterproof paper. You commented that you noticed that when spearing on your left side, the propulsion wasn't as great as it was on the right. I have the same problem, only on the right side. Tried to figure out what I was doing differently, but so far haven't come up with anything. Have you reached any conclusions?
I guess I am getting old, but I really admire all the creativity and insights that these posts contain. Hopefully someday I will be able to contribute something also.