For this one I use
x, y spacing: (.01,.01)
Primary line each: 10
which when zoomed way in gives a 10 thou grid and when zoomed out to normal size creates a .1 in grid. You can then move the x/y start positions so the grid matches one of the connectors and the rest of the connectors should then align on the grid if they are correct. In practice though to check pin alignment I usually set the tool bar to in and read the x/y starting position of one pin then make sure all the rest are an exact .1 multiple from those x/y coords (changing the x/y in the tool bar if they aren’t). I often find snap to grid more annoyance than help and tend to disable it sometimes. As I’ve noted I’m not very good at svg editing (I learned it along with parts making) so there is almost certainly a better way to do this than how I do it.
Peter