This is the handful of darks I managed to capture last night when trying to figure this out.
Could my temps be varied too much? Seems pretty close. I'm not super picky about how accurate the darks are yet, I'm just trying to figure out how to make my autoguiding run realiably. I'm close, It will be going fine for a while, then a random spike of 10-20 arcsecs that has me banging my head on my dome! It then settles down again for a while. I'll have to graph my data and see if it's random or repeating. Another topic for a different thread.