Do keep in mind this whole thread was from six years ago, with a very different version of Tinker's than exists today. Literally everything in this thread is no longer applicable.What I would like to leave here:
Damage modifiers are heavily weakened, almost not worth tinkering with. So if you are going to use modifiers, use the ones that are useful. For example, knocking back to hold opponents. Remember in the original Diablo how the bear bow was so divine because the opponents never got to you? Yes, sort of. Go ahead and throw your luck on him to get extra drops.