In the last month, I finally upgraded my flat strategy from a 20 dollar tracing board to Spike A Flat. I had used it with my C 9.25 with good results, but have struggled with it on my RASA 8 combination with my ASI 294 MC pro. I take my flats with the panel resting on the dew shield. Every flat I take leaves a horizontal banding effect. I have not had this banding with the tracing board when I have retried it.
This is present at flats anywhere from 0.02s to 0.8s. I have tried all different dimmer settings with resultsing smaller and larger bands, but still bands. I have also rotated the flat panel to 45 and 90 degrees with the exact same pattern. So I don't believe it is any wiring in the panel. I have also rotated the USB3 and cooler power cable with no change. I have removed the cooler power cable and moved the USB 3 at 0 and 90 degrees with the same horizontal pattern. I also tried adding 1 -3 layers of white T- shirt layers persistent banding.
Finally, the banding tends to not be in the same place (walking banding) each sub flat. Any suggests or thoughts would be greatly appreciated.
Here are several examples in final image, master flat, and individual flat. (The flat frames are severely compressed jpgs. They look fine other than the banding at full fits resolution)