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IMX294 sensors TYPICALLY do not like exposures under 3 seconds in the gain range of 120 to 150 - strange, I know, but it's a well documented issue...
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...
As for your dark frames not calibrating out the sensors amp glow - I would make sure you're being very careful about your dark frames...
Your darks need to be at the same sensor temperature, same duration, same gain and offset as your light frames.
I've made a relatively extensive dark library for my camera, (as I have lots of cloudy nights to play with).
I have 30, 60, 120, 180, 300 and 600s dark frames, for all of the following scenarios.
-10°c sensor when the cooler is sub 50% loaded.
-10°c sensor when the cooler is over 50% loaded.
-20°c sensor when the cooler is sub 50% loaded.
-20°c sensor when the cooler is over 50% loaded.
At both Gain120, Offset 50 and Gain0, Offset 100
I have them all integrated into master darks, and I just select the master dark that most appropriately matches my light frames... If it was cold outside and I was running -10°c, and the cooler was at 24% usage, I use the low power dark... but if it was warm and I was running -20°c at it was at 74% cooler power, I run the high power -20 dark
Also, its 100% never a good idea to trust an auto-stacked, auto-calibrated result that's being auto-stretched then displayed on a phone/tablet display... Never judge your images on anything less that the machine you're going to process them on..
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