I've alternated between crumbles and pellets for years and never seen any difference in laying depending on which they are eating. Crumbles are only pellets ground a little finer so there is no difference in content, but I have a lot less waste with pellets. When crumbles get billed out, they blend in with the bedding but when a pellet lands on the ground, they can still see it and eat it. Once I gained access to the Flock Raiser pellets, I've found that even super young chicks are able to eat pellets. When I am brooding chicks myself, I do usually buy some chick crumbles, but when I have broody hens raising the chicks, I leave them on pellets. The mama hen will break up the pellets for the chicks and/or the chicks will just search through the feeder for pieces small enough they can eat.
I do sometimes feed whole corn as a treat - sprinkled over the bedding to encourage them to scratch in it. But, corn really doesn't offer a lot in the way of nutrition so I would never use it as a feed. I don't know what crimped corn is, but my thought is that anything they do to process a food further, usually results in a lower nutritional content. For example, I would never waste money on cracked corn, as oxidation starts as soon as it is cracked, resulting in even fewer calories than in whole corn. By the time it is cracked, bagged, sits on a store shelf for weeks, then is purchased and fed, there is so little nutritional content left that it isn't worth whatever they're charging for it. If crimping cracks the outer shell in any way, I would imagine it also loses nutritive value pretty quickly.
Well darn. I am checking on them frequently today to make sure they have water, and collect eggs before they freeze. I had a couple of eggs in my hand but with the glacier gloves and glove liners, my hands are pretty clumsy and I dropped an egg. Did it land in the bedding where it probably would have been unharmed? Oh no. It had to land 1" over, where there was a hard surface for it to crack and break on. Oh well - the hens immediately volunteered to clean up my mess for me. They're very helpful that way.