Heck, I wouldn't know much about casting boolits. Just kidding, been doing it for well over 50 years. Pic for few of my boolit molds.
That's a very nice collection of molds! I am a cheap skate so nearly all of mine are Lee, which I have had good luck with once I get them flowing. I have several six cavity molds, but I almost prefer to use two separate two cavity molds and let one mold cool while I am emptying and filling the other one. While I am casting I almost always have a hot plate melting wheel weights for making ingots out where the smoke won't bother me. I try to minimize my motions and when I really get in the swing of things I can churn out a surprising amount. I am sure you operate in a similar manner, but others here might not be familiar.
It is a tremendously satisfying feeling for me to turn a bunch of dirty old wheel weights into trays of nice clean shiny boolits. I need to start stocking up on wheel weights now that the zinc weights are taking over. I have a few hundred pounds but you know how quickly that amount can be used up. The recycler I usually buy from is now charging 40 cents a pound, but I suspect that in the not too distant future that will be a bargain that we will only reminisce about. I am also thinking it might also be a good idea to start building traps to place behind my targets.