I had the same issue, even with F-One replacement valves the same things happened. Total shit show. I fixed them countless times and eventually gave up and bought North.
If I were to try again I would use North bladders or North valves, they are much higher quality.
F-One valves on old kites are just really bad
the kites are OK, but no where near as good as the Rebel or Edge or Screamer. But then I don't wave ride, so .... *shrug*