Ok, have played around in CCDStack. See attached where the weight is shown and it's obviously taking exposure time in to account one way or another, as the 300s exposures are in the 4's and 180s exposures are in the 2's.
Considering my PC limitations at the moment which make PI a bit more problematic than it already would be on a good PC, I'll just trust CCDStack is doing the best I can for now.
Thanks all for your advice, I learned some useful info from this thread.
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