That was a good distance from the display. How far away were you? As far as iso, I find auto exposure camera settings works well with the phantom for fireworks. It will have a high iso to try and compensate for darkness but shutter is usually in the ballpark. You can always drop the ev if you want to. But even though that high iso isn't something I'd normally choose, in post edit you can drop brightness down and adjust it nicely. The phantom camera isn't really like a dslr camera. You actually want a brighter video from the phantom in the dark for fireworks. If it's too dark, things like cityscape lights detail in the background will be lost and won't be recoverable in post. You can't recover light in post edit with this, but you can adjust darkness to taste. Auto is the best setting for fireworks to bring back workable video in post edit to clean up.