:
When they recover low/mid - Fulljump (backwards) as long as possible and reverse Uair the IC's before they can even regroup.
(I'm talking FAR off the stage.)
(Nana is
often smashed away a bit more far away due to her bad DI + higher %)
Try reverse Uair'ing Popo. If he successfully couter attacks you by himself, he'll at least put himself in a little harder spot to recover from.
Go out there and mess with 'em.
Also try WKRO (WizKick Roll Out) -> DJ Nair gimp.
When they recover high - Not much you can do here due to Iceblocks and or Blizzards.
Try a fake out jump to make them Blizzard, and then Uair/Fair just as it's finished.