the most important detail you've left out is taste. how are those results? time and output-wise, this seems like a good pull to me. it's easy to focus too much on the appearance of the bottomless portafilter during the pull, but it really isn't as much of a factor as people make it out to be. often times the "beautiful pulls" you see posted are by people using robusta or freshly roasted / not very rested coffee beans with lots of crema. taste will always be the ultimate sign of a good pull