i know this isn't really what you want to hear, but rather than causing yourself more grief over a minor thing like the tibar, why not just enjoy the xp and gold they provide you. granted they are annoying because they run away, but when you ignore them they will return. and if you have area affecting magic, that helps. i'm not trying to be insensitive but it just seems like restarting because of the annoying tibar issue is a little extreme, as this isn't a game breaker, and in the end you are only stressing yourself out.
i agree its annoying but i just killed them all. of course i actually meant to attack one because i was hunting for experience. i mention this because i doubt Larian will fix that issue in this game. maybe in DD2 this won't be a problem however, which would be nice.