The frame numbers you give above suggest to me you have not used "force film" in DGIndex. The first appearance of the Star Wars title card should be in frame 689. If yours is 861, then you almost certainly have pulldown flags honored (because 3:2 pulldown makes 4 frames at 23.976fps into 5 frames at 29.97fps, and 5/4 * 689 = 861). Check what Field Operation you have selected.

I have never used Womble to fix GOPs. In fact, the only time I ever used Womble it output an MPEG-2 stream with broken sequence end codes.