Have you tried having the crates in separate areas or side by side? I would really think that having them eat alone in their own crates would be best. That way one isn't being overfed and the other isn't being underfed.
My Wesley gets very distracted with even wanted to play with us during mealtime, so I will sometimes have him eat in his crate, and sure enough he finishes his bowl.
What are they normally doing before they eat? Playing or sleeping? Wesley's meals are usually right after he wakes up either from the night or from a nap. And he seems to need about 15 minutes of play in there to get himself up enough to eat.
& two human rugrats!