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My Player One Artemis-C is a IMX294, and I experienced similar issues around flat frames until I got a very dim light panel and was able to take 3s UV/IR flats, and about 7s narrowband flats...
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I've been using an A3 copying board (variable output LED lighting) for several years for doing my flats, mainly with a DSLR but I've never had a problem doing it in this manner. I mentioned to an astronomer friend in Arizona I've known for 20 odd years online and he bought one online and loves it. He has a better range of cameras and mentioned he's recommended it to other friends locally.
My unit was only a cheap Aldi unit and it's been great for the purpose and conveniently runs off a power bank and is light and easy enough to sit on an upturned telescope. Al long as I get my scope near vertical after/during my imaging session it sits there by itself and suitable for up to 10" scopes I believe depending on tube size.
I keep the original plastic clear sheeting on mine and peel it back when I want to use it and fold it back over to keep dust and marks off the board.