Glad you got out and about being lit on a 12 m. I was thinking might have been hallucinating with my 13 m. Could have sworn there was a strip of water offshore where it might boost 4 to 5 mph beyond the wind plot that shows up below.
Watchout for those sudden wind shifts like at about 5:10 pm. The anenometer falls into the lee of some wind shadow with west winds hence he sudden dropoff.
Everyone knows how to deal with a wind shift offshore if you are already riding a ways off the beach, right? They are not that uncommon with arriving cold fronts or winking out thermals around sunset. Best way to deal with it is to anticipate the shift through forecasts and watching for signs, but failing that, what do you do?