I am going to shoot 2 36 exposure rolls of Portra 400 for a Bengal breeder. I wanted to push one roll to 1600 for some nice action shots. These are only going to be used for the website... One regular for finer grain. Perhaps a slightly larger print from that roll. I'm using window light for back and ambient light and a 500w silver reflected light (daylight balanced no 80a). I'm not sure if I'll even need to go to 1600 until I see the available light. Any thoughts?