I've got a story on KDP and it's not doing so hot. The problem is that since it's in KDP I've gotta wait 3 months to switch it over. And somehow I missed the date and it re-upped itself so I've got months yet before I can open it up to other distribution
Amazon gives me my best sales, but you're better off spreading your stories around far and wide. Like they say, people have to see something at least 10 times before they really notice it. So if you're locked into one venue, you're missing out on an opportunity to get your name into peoples' heads.