Good description of how the track is playing, Miff.
As far as the horses, two different surfaces, different strains and stresses, different injuries. They reminded the trainers not to work horses over it until the horses got a bit used to the new surface. Remember when they went to synthetic (deeper surface, more tiring) alot of horses were coming up deeply muscle sore, tired. Less bone, more muscle injuries. Synthetics are kind to the \"wear and tear\" chronic stuff of claimers and campaigners. Sand, not so much. Old track was more dirt than sand. Dirt worse on bone, sand better IMO.
This is a better surface than old SA dirt I hope, but all the water has sure made it fast (think of running on a compacted beach at the water line).