I had teeny tiny tubers from KA’s Bo Peep two years in a row.  Like, marble size tiny.  I thought surely they won’t make it, but they did great.
Then last fall I dug up my plant and it had sort of normalish small tubers.  Like, maybe the size of a fingerling potato.  This winter they all rotted.  Kind of weird.  The skin on the tuber was strange, too, almost peeling like river birch bark.  I can’t help but think they outgrew their skin which ripped up like the Hulk’s clothes, and then they couldn’t cure properly for storage.  ?