Hey Robbor, Happy New Year
I'm confused with this question. I currently have about 60 molds. Some molds have multiple cavities of the same size jig (production molds), and some molds have multiple cavities of different size jigs. In either case, I found that I can pour faster and more accurately with one jig at one time, loading hooks and unloading poured jigs. I've tried pouring every cavity, but some cavities didn't fill well, and it as a waste of time. I also tried to pour every other cavity, with the same problems. I personally feel that once you get in a rhythm of pouring one at a time, it goes much easier, with more complete pours. Every mold I have pours slightly diferent. I write the info on the mold. Which way to tilt, how far from the pot etc. This reduces a lot of trial an error, and with 60 molds, I can't remember all that in my head. Finally, I only pour one mold at time, and when I'm done I go on to a different mold. I hope this answers your question.
"Practice, practice and more practice and when you think you're good, practice some more." circa 2006 Cadman