temps/humidity are good. to poop multiple times is normal for some fast growing babies. Coloring might be due to dust you use if you use tons of it, you need just to coat food slightly. how does poop look like? you gotta use dust every second feeding, how poop like after it eats non dusted food?
at any rate if something would have been wrong it won't be eating a LOT as you're sayingbut i'd rather make sure there is actually nothing wrong.