Changing your mind is a reasonable thing to do. The example you posted, where you debated yourself () is reasonable (I don't know the reasons you changed your analysis and vote, but if you provided an explanation for everything you did, you should be okay). The DFs may still pounce on it (which they did and should have, that's a good opportunity to get a townie and not look too bad when it turns out they were "wrong"), but you should generally be okay.

Changing your mind is what reasonable people do when they are presented with new information. But they should always point out what convinced them, because they either look like an indecisive leader, or a DF who is trying to get a lynch, without worrying about who it is.