If their behavior were to be changed I wouldn’t want them to become basically land vultures. I think a better change would be that if there is one it follows you at a distance. After a timer goes off another one shows up and they both follow at a distance. Once there are three there is a percent chance they will attack all at once. At four that chance increases and at five it is guaranteed. Something like that would be different than vultures and wouldn’t rely on the player getting wounded or encumbered.
IT doesn’t bother me that they run into spikes or attack the walls of your base, personally, but I also wouldn’t care if that behavior changed as well.