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Sounds like the little one just doesn't like the litter. Some kitties are extra picky about these sort of things.
The only brands my Sammy cares for is either Arm & Hammer Crystal blend or Scoop Away. The consistency of both of these is real fine,soft, and sandy. Very comfy on his particular paws I guess. I have tried other brands, andSammy would literally play in the box. I'm talking you would have thought he was playing at the beach! He'd roll around in it like a chinchilla, then toss it around, throw it in the air, all while purring! He was a little litter maniac, he'd make such a mess!
I'm sure you'll have better luck if you find out what type of litter he was used to before. The kitten may just have been through to many changes, like the move to his new home, and this litter changing business may be too much for him to handle!

good luck! can't wait for pics!