OK,

I "tricked" the script into acquiring the flats I need with about75% yield, 25% I'll have to throw away. This is good enough for now and I see how I can optimize my "trick" to get a higher yield, albeit at the price of more time neede to get all the sky flats data.

I'm not conversant in the VBS scripting so I can't dive in for a permanent fix and I'm not asking for one. My trick was to set the ADUAcceleration constants to 1.0 and make the tolerance wider. This setup ran through the algorithm to produce the fewest changes in exposure time during a flat series (filter/rotator combination). If the average ADU dropped below minimum tolerance midway in a series, the exposure was changed. I suspect that logic is separate from the adjustments driven by the ADUAcceleration factor. In any event, with the right combination of target ADU and tolerance, I can maximize yield in a series of number of frames with the same exposure, which is what I need. I'll share some before and after pictures once I get the needed data sets to show you what happens for these CMOS sensors and how flats acquisition strategy can eliminate that issue.