I have a very similar setup. EdgeHD8, Celestron OAG using ASI174 Mono Mini, ASI294MC Pro, CGX Do you have the ASI174 set bin at 2X2. This makes it more sensitive and is better for guiding. Also you can make sure it is set to its highest Gain as well in the PHD2 Brain. Clear Skies
Thanks for the comments! No I do not have the ASI174 set to 2X2. I'm not sure I can do this with the ASIair. Speaking of which; I am using an ASIair and not PHD2.