Chris, I use basically the same setup as you describe (including ST4 cabling) and it works OK.
the only thing I can think of is that, since phd starts up with 1 sec default exposure and does not support very short exposures, you are getting extreme overexposure in daylight with the QHY5. WDM activates the laptop webcam on mine - are you getting a WDM image from the QHY5?.
phd seems to do strange things with the display greyscale - it is not always what I would choose, but it still works.
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