That’s good you are talking to Chris, he pratical expertise on sodium tail imaging is second to none,
I have the QE for the ASI585MC at about 90% for the red when I read this from ZWO; https://i.zwoastro.com/zwo-website/manuals/ASI585_Manual_EN_V1.0.pdf
The mono IMX585 sensor cameras are just coming out and Player One and QHY have them on the market with ZWO coming soon. They will be significantly better QE for this sort of application as you will get signal on all pixels instead of primarily the red and some signal on the green (and almost none on the blue).
Martin