I was there at the same time (on the end of the last video) and this was one of the calmer days that actually allowed you to get out of the harbour in any type of comfort.
On other days watched a few 30-40 ft yachts attempting to get out and turning back once they got out and in the rather large swell. The swell direction was straight at the mouth of Fowey.
Took a run out to Polperro on the 12th and getting back out of that bay was rather exciting (at least now it is, at the time it was a bit hairy to say the least and that was at about 6 knots) it was like being on a kids sea saw while someone hosed me down.
Added a few pictures for the hell of it one of Polperro on a calm day and the other of Trevose in the north of cornwall on a rougher day
Ps Is there a way to find the Sea State on any given day in the past?
Big waves, small boat ;)