This isn't going to answer your question, but I think it's worth saying. There is nothing wrong with passing races when you don't have any insights that give you an edge. If these races become more popular, there will be fewer question marks complicating the analysis because the horses will actually have a record.

If I was going to try to learn about this type of race, I would cut out the PPs for every turf sprint from the DRF every day (and clip them together with the TG numbers). When I had "at least" 100 races, I would sit down with a pad, pencil, and Bass Ale and start looking for similarities among the winners and beaten favorites trying to come up with any positive/negative value situations.