The other mistake I made a lot was this equation I had in my head that the higher the tyre pressure the faster the ride. A mistake I still make today sometimes (my thighs have the scars to prove this).
Looking at the video a lot of people are over-braking which is what is causing their problems. Brake on the smooth bits, give your front wheel less simultaneous things to do.
Pulling manuals had obviously not been invented in the 90's!