one super left on each hive ... what to do with it ?

[For want of a better word]

You could place an eke and crown board above the double brood and they will move stores down into the brood box thus no need to nadir your super
This has worked for me .

If you've more than one hole in the crown board reduce it to one

Just as one does when getting bees to clean up the spun out frames
KISS

 

[Beefriendly]

Just as one does when getting bees to clean up the spun out frames
KISS

KISS...stick wet supers by hives and job done, can't get simpler than that /BIG BIG wry grin/

 

[enrico]

And just in case a beginner reads the first part and not the last......HE IS JOKING!

 

[Beefriendly]

Well spotted Enrico /big grin/.
If there is no flow on just stick them on top , no need for crownbiards...But clear no longer than 48 hours afterwards.
You will still gets lots of confused bees flying madly around as the short dances don't indicate "It's above you."

 

[Curly green finger's]

Just as one does when getting bees to clean up the spun out frames
KISS

" Cheers" cheers...
But with out the eke!