I had a terrible experience with this charger as well on a recent trip returning from San Diego to the Bay Area. First a long wait in line, and when it was finally my turn the charger I got was super slow. The other sites in the area seemed to be full according to the in-car map, but given that I was barely getting any power I decided to drive on to Westminster and was lucky enough to get a spot. Also not ideal though, because that's a 72kW site.
Any recommendations by the locals which chargers along 405 or 5 usually work well?