Didn't read all the responces, so if it has been stated before, sorry for the repeat.
One of the earlier comments was crumbles over mash, mash over pellets. To the best of my knowledge mash and crumbles is the same thing. Or atleast it is here.
Laying hens are going to be on the skinny side, they put allot into the eggs. Feed them laying pellets/crumbles, doesn't matter which, cause when they get hungry they will eat. What I have found does induce them to eat a little more is to stir'em up every so often, go out walk into the run make'em move around, first stop will be the feeder.