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Brendan, welcome back. It is great to hear from you again, we have been worried. At least your lower back has been fixed, your luck finally may be changing. Best wishes for the neck.
I have been testing a new idea for the PWM cooling that should solve the "stripes" issue. A thermally conductive (but not electrically conductive) thin film between the cold finger and the back of the sensor with Arctic Silver 5 on both sides for improved thermal contact. The electrical separation allowed me to ground the cold finger without grounding the back of the sensor and this removed the stripes completely.
I have been testing this solution by imaging over multiple nights and it seems to work well. The sensor temperature is rock-stable.
I still have to quantify the loss in the thermal transfer due to the film before making final conclusions but I don't think it will be very large... hopefully.
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