chicknmania got a point there as does
Wyorp Rock.
I don't like attracting rodents either nor do I like the feed waste with them scratching & tossing feed around, picking what they want.
I got 2RIRs & 2EEs chicks end of Oct '15 (2wks old), put them on medicated chick started but doing FF (fermented feeding) method. LOVE IT! Poop is firmer, less stinky & they love it. I also put ACV in their water, they drink less due to the 'wet' feed. They're 14wks 2 days old today & still working on the 50# bag of feed; started making 1 cup per day when I first got them which lasted several days, now using 2 cups per day, think I have about another months of feed to go. It's a bit more "work" & feed them 2x day (morning & early afternoon), they do run the yard when I'm home. I toss them veggie scraps in the mornings & mealworms a treat that I've used for training. Recently started a mealworm farm just for fun.
I'm thinking the pellets being different for your girls, hence their apprehension but they could be waiting for more cracked corn

You could try leaving the pellets & keeping them in their coop/run with no treats for at least a day or two (make sure they have water)...They're smart & we do spoil them

Good Luck