Brendan, good progress
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Luka,
The Mono sensor has a lot of remanence, and it's very difficult to make flat like that, the option " sensor clr" works well but starts at 1 sec.
Can make sure to put it in forced mode for example with 0 in the box it always empty or when mono and active the "sensor clr" is all time ???
For the QE, it is very difficult to measure, you need a source of light whose exact spectrum and power is known. 21% seems small and 60% big, it seems to me that I had read somewhere 42%