OK, relacing didn't work, the tongue pad didn't work; the thing falls down after maybe 30 seconds of walking. It's time to take it to a cobbler. Will most cobblers suggest tacking the tongue? Is there a way one can do this without ruining the shoe or permanently altering it? Ideally I'd like to be able to undo whatever work they do by the time the shoe is broken in.
Question answered here.