[cypher]

I wouldn't clean out all your substrate so often, you only really need to so spot cleans, any areas where you ham pees (don't worry too much about poo, they eat some & the rest is dry) then just clean parts of the cage, maybe half or less at any one time & always keep some of the old substrate & nest material as well as either leaving some of the hoard or replacing it with some fresh mix.
All hams do hoard but if your ham is hoarding a lot you can cut back on the amount you feed, don't cut back too much but try not to over feed, it could be that over cleaning the cage is making your ham feel a little insecure & more inclined to hoard more than usual.
Does your ham have a sand bath (with chinchilla sand)? Most Robos will either pee in the sand bath or in the wheel which usually means you don't have much wet substrate to worry about & can clean less.