Glad you were able to get it reduced! That happened to me, lesson learned as well lol... I say whenever in doubt, it doesn't hurt fighting it. The cop had a good laugh when I asked if I can fight it and said I got nothing to fight, I parked within 3 metres of the hydrant (I wasn't directly in front of it still, but within 3 metres according to him). I gave it a shot and brought my rate down as well. So tl;dr it's worth it taking the time to "discuss" it lol good job!