Ok 90 too low as well
To those struggling with the offset pulling it into DSS is working a treat.
Actually pulling the fits files into maxim is helping too, star centers peaking at about 62300 so I reckon I can up gain by one notch.
Whew glad we've got clear skies, could be a while tinkering. The hiatogram in maxim also shows a min value of 900 for all pixels so offset must be about right....... Errr maybee.