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it's nothing in the configs, sometimes you just have some bad luck and certain things are hard to find.
if you are playing the DW20 pack I'd suggest going to some mystcraft ages and make a flat plains biome, those are usually very good for getting animals.
but ofcourse the problem is, you need feathers xD
There shouldn't be any configs that modify chicken spawning, that is a purely vanilla thing. Have you installed any outside mods (Mo Creatures in particular)? There's also a chance a jar mod (such as Optifine) could cause this problem, it's slight, but possible. Give us a list of any extra installed mods you have, if there are any.