Swing at 3-0...really??? Why work the count to 3-0, and THEN swing? The 3-1 pitch is just as good, and you won't feel like such a complete jackass if you mis-hit something that you shouldn't have swung at to begin with.
I don't make my players take on 3-0 unless we are down late in the game and need a runner. I let them swing away if they get their pitch.