I have had a rash of these this year using different presta tube mfr'ers with my Campy Vento rims. Rewrapping with a thicker cloth rim tape may have helped but what I did was take a old tube and cut the tube in half and then 1 inch away cross cut it again which leaves a small 1 inch wide rubber band. I then punch a very small hole through both walls in the middle and push it on the valve stem...providing in effect two plies of rubber tube. This so far has fixed the problem. In the case of the Campy Vento wheel, the interior rim hole is not precisely round and the base of the stem is getting pushed up there and causing a tear.
HTH,
George