As well you "should" split the hives that have the best characteristics, not the ones who get to swarming first.Thank you for all your replies. I have much to think about. So much of this (hobby) is about learning. I will get a system down for doing manual swarm control. Just need to find what works for me. I love this community!
split from the best for gain/replacement, use the worst for NUC/Split building to hopefully make small gains in you characteristics.
random events is a plan, there could however be a better one.
GG