Great! You've made it work for night shots. For me, it's taming contrast. Never used Diafine before. I think if you get the shadows exposed correctly, the trick is to tame the highlights. Arista EDU 100 and 400 does very well with stand development. Had great luck with HC-110 diluted 1:100 with Arista 400. I agitate for the first minute then let it stand for an hour and 15 minutes. The highlights exhaust the developer faster than the shadows. This allows the shadows to continue to develop after highlights have slowed or stop developing.