I've had a hard time finding any good information of how the bayer matrix should be with these cameras. Some forums like on cloudy nights implied that each chip could possibly have a different one (I kind of find it hard to believe).

I did have good luck with color. I made a pinhole lens with foil and a color chart with construction paper. So if for example I force RGGB and up-bottom orientation in Siril(I believe this setting used to be called kstars-ekos/pixinsight compatibility) and some white balancing, I get the attached image.

I've also taken a test image of M33 and the colors seemed pretty good this way. I've had some set backs with my setup so that is as far as I got. I hope to get back on track after all these holidays.

I'm not an expert on maxim but maybe it has something to do with the up-bottom orientation?