I had a similar experience when I had 4 broodies at the same time, and was new. In my quest to move eggs around between them I opened an egg to eggtopsy that had a live chick in it. I decided that I needed to back up a bit on my intervention.
I did trust my broodies to take care of their chicks and they did. My flock is unimpressed with chicks in general now and when they go broody again I will leave them alone (someone quote me on this when I try to intervene) until they leave the nest to raise chicks, then I will take the remaining eggs and put the live ones in the incubator and finish hatching because that's where I saw the most loss.
I really appreciate the "conclusion" posts after someone has gone through different experiences. I think they really help us all learn and apply to our own experience or add to our chicken knowledge bank!
I think you did a great job after these girls threw you into the hatching chicks game!
Thanks for sharing your experience.