VooDoo NV shafts

I have a 910D2 driver, 9.5 degree, with a NV VooDoo NV6 stiff shaft.  I would like to add a 910Fd 3 wood, 15 degree.  Does it make sense to get the NV6 shaft in the 3 wood as well or would the NV7, due to its added weight, be a better fit for the shorter 3 wood?