Start it out slow, and then gradually build the speed up. If the motor is going much faster than the liquid, the bar will not spin, and so fly off. You might find you cannot stir as fast as with your smaller starters though.
I had a stir bar go *bad*. It used to work, then it quit working. It wasn't thrown. On start-up it would make about 4 or 5 revolutions then just stop and vibrate in the center of the flask. Speed variations had no effect. I had another stir bar of same size and it works just fine in wort and in water. Somehow it's magnetic properties changed so I tossed it.
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