Matt, How are you using maxim to focus? Are you just using the numbers on the big focus display or are you automatted? If you're using the numbers, are you focusing on a nearby star then moving to the object?
I've wondered how maxim can drive a robofocus or similar when images are only coming out every 5 minutes or more.
I kicked off with my meade DSI, it was fine for planets, but useless for deep space. My tracking wasn't anywhere near good enough to get an image that wasn't blurred. Now I have a dedicated guide camera and scope I'll give the DSI another go, when it stops raining
I bought light pollution filters to get longer exposure times and it has worked. I can get double the time now before hitting sky fog.
I just bought Photoshop for Astrophotographers by Jerry Lodriguss which is full of info on how to do it but not much info on when to do it