please rate my brew [sage barista pro]

Hello, I have this machine for 10 days and never had anything like that before, so I am very green in this. I settled on my recipe about 6 days ago when I was satisfied with the outcome and today I got bottomless portafilter, and this was the first shot I pulled. There was some spraing in the beginning and there is a huuuge crema waterfall since the middle towards the end, is that okay? It looked a bit weird. Taste was the same as the last week, no complaints there, but if there’s a room to improve I would always like to do that. Thank you in advance, and feel free to ask some follow up questions 😌 19g in 40g out around 27-28 sec including 8 sec preinfusion, internal grind setting 4, on machine also 4, beans slightly darker medium