> > ... split the hive into as many nucs as
> > I am able to make up using the swarm cells at hand.
>
> ... I wonder if I had taken the nucs away and distributed them in other yards
> if they would have done the same....

Dunno for sure but I suspect it's the leaving them in the same spot where you
went wrong.  I've had no problems with the swarm cells hatching, queens mating
and start laying.  I've even left the nucs in the same yard but different
location.

As always, your results may vary depending on time, location, season, sun spots
and whether you're left handed!

Sincerely,
Aaron