Just to add some data to this discussion (although I'm not sure that's what we need at this point #-o ) here's the StGTO grid from a video of our last race @ HPR. I drew the lines in where the current dots are.

This supports Glenn's argument. If we're not going to change the row spacing and we're still going to have 3rd (Turpin in this picture) ahead of 4th (me), I don't think staggering the grid or not will make much of a difference to anything.