Increasing the frames count from 30 to 60 is exactly the same than increasing the subsamples from 4 to 8 in VWD. In both cases, there is an interpolation between the original frames (certainly Barycentric in Daz or Poser, Linear in VWD because I don't know rotation informations). The interpolation made in Daz will be better but it don't resolve your problem.

If increasing the subsamples don't resolve your problem, I'm sure the problem comes from your animation. If this animation is made using a motion capture tool, there sometimes some defaults in the animation. I regularly had these issues and the only solution to correct this is to delete the frame that generates the problem. Please, could you look at your animation frame by frame and see if there is an abnormal jump anywhere on the character. If you delete this frame, Daz3D or Poser will modify their interpolation and the animation will be better for applying a cloth simulation on it.

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