Instax Wide should probably be rated ISO 4000 in bright light

Took a few hours on my day off to try out the Lomograflok back. Used it with the Intrepid with a 150mm/f5.6 lens - the 90mm Nikon doesn’t fit. I came away a bit disappointed that I had to waste a box of Instax Wide to figure out that the film needed to be exposed at around ISO 4000 in bright light instead of ISO 800, which is the rated box speed. Finally got some semblance of a decent exposure,…