The 2nd coffee is more narrowly delicious with the lightest cup and the darkest 2 cups coming out rather poorly. I can see someone deciding to do something on the lighter or darker side within those bounds, but I think it's best within just a few degrees starting at the start of 2nd crack. There's a very dramatic shift in the overall balance of flavors right exactly at the start of 2nd crack where everything nice about the coffee has both been developed and not been destroyed.