I don't currently have chickens, and only had some for the summer... But having kept animals all my life I would suggest that if they are acting hungry and even eating an egg or two, that they are likely hungry. I would up the amount (maybe feeding 2-3x a day) just to get an idea of how much they are eating if you give them free feed. Then once you get an idea of how much they need, you can taper it off. At the beginning, since they are hungry, they may over-eat for a couple days until they get used to having enough food, but you will notice that they back off their feed, or they get chubby (one or the other) which are both signs that you can step back on the amount.