well I don't know about you guys but 22a works for me in my group, especially in the corner.
it doesn't suck, it's one of the better string enders Miyako has. When people begin to eat 22A -> 2c frametrap setup or 22A dash 2a, they'll start to anticipate the low attack after the stomp....so you can mix it up with something else like dash throwing or 623b.
It's all about guessing game in the end. dash 5a 5a 5a 5b 6b 2a 5c 22a is one of my favorite string, if you don't execute it quickly, there are easily gaps between 2a 5c and 5c 22a which people sometimes fall for.....
623b is also a great move even if it has a lot of startup, and 236b 6b throw is still evil against people who doesn't know much about Miyako, these are some of the moves you can use in the middle of a string.