Try a debanding routine. Startools and Pixinsight have this function.
Also, if using DSS, try a Median Kappa-Sigma, with 50 iterations and at least a 2 x drizzle, or perhaps consider super pixelation. It CAN have a big effect.
I always found APT better for DSLR capture than BackyardEOS. And APT shows the sensor temp after each frame as well - I have seen alarmingly high figures (once topped over 40°!!!)
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